Some of the best choices based on your requirements can be 1. Acer Aspire ES1-521 The laptop comes with a 15.6 inch Acer CineCrystal screen. You get HD LED display offers a resolution of 1366 x 768. It is powered by 1.8 GHz AMD APU A4 6210 processor. You get 4 GB DDR3 RAM. You have 1 TB of hard disk space and you can also expand it if you want to. The device comes with Acer branded webcam and DVD writer as well. The laptop comes with FreeDOS 2.0. The graphics are taken care of with AMD Integrated Graphics. It is available at Rs. 18000 on Flipkart.
2. Dell Vostro 15 3558 The laptop also has a 15.6 inch display at a resolution of 1366 x 768 pixels. It is powered by 5th Gen Intel Celeron Dual Core processor. The clock speed reads 1.5 GHz. Intel HD Graphics 5500 takes care of the graphical requirements on your laptop. Dell Vostro 15 3558 comes with a 500 GB Hard disk space coupled with 4 GB RAM. You have access to HD 720P webcam on the device and DVD writer. You can buy it at Rs. 21000.
3.Dell Inspiron 3552 Dell laptops are known for their build quality and performance. The Dell Inspiron 3552 is powered by Intel 3rd Gen Pentium Quad Core processor. The clock speed is an excellent 1.6 GHz. The device has a 500 GB hard drive space. It is coupled by a 4 GB RAM capacity. The TFT LED-backlit display has a resolution of 1366 x 768 pixels. The laptop does not have any operating system preinstalled. You get FreeDOS on the laptop. The Inspiron 3552 has Dual speaker with DTS Studio Sound and a HD webcam. You can buy the laptop at Rs. 19000.
4. HP 15-BE002TU The laptop excels in almost all the features including look and feel, the hardware and the performance. The HP 15-be002tu runs on 3rd Gen Intel Pentium N3700 processor that runs at 1.6 GHz. You get 1 TB of hard drive space and 4 GB RAM. The 15.6 inch display provides HD LED backlit screen. The laptop comes with DOS operating system. The graphics are taken care of Intel HD graphics. The laptop offers you Dual speaker with DTS Studio Sound and HD Webcam. Buy the device at Rs. 20000.
5. Lenovo Ideapad IP 110-14IBR Notebook The laptop has a 4th Gen Intel Pentium Quad core processor powering it. The clock speed reads a 1.6 GHz with a turbo boost speed of 2.56 GHz. The device has a 500 GB hard drive space along with 4 GB RAM. The Compact design of the laptop makes it a good choice from portability point of view. The 14 inch display comes with anti glare flat display. Intel HD Graphics handles the graphics requirements. There is no CD Drive though. The laptop is available at Rs. 19000.
Here are some of the laptops that you can checkout for under 20,000 Rs.
HP 245 G4,P1b38PA
This laptop has thee 14 inch display with 1080p Full HD support. It has AMD A6 Quadcore processor. For most of the office and student use this can be enough processing power. You get 4GGB RAM along with 500 GB HDD. The machine seems to have FreeDOS on it. So you may have to install Windows 10 or other OS of your choice. You can get the machine at the price of : 19,150 on Amazon. Check the device here: http://www.amazon.in/HP-245-P1b38PA-Inch-Quadcore/dp/B01FSSZIMS/
Asus Eeebook E402SA-WX014T
This laptop is 14 inch display with 1366x768 resolution. It has 2GB RAM and 32GB this is more of suitable for the student usage. Though you may need additional disk space. For which you can use the external drive or USB HDD. It has 2.16GHz Intel Celeron N3050 processor which is fast enough for the regular usage. Also it has Windows 10 home installed. Compared to other devices this one is lightweight and compact to use. You can get this machine at the price : 16,490 Rs. You can get it through Amazon. http://www.amazon.in/Asus-Eeebook-E402SA-WX014T-Integrated-graphics/dp/B01C70I8BS/
Acer Aspire ES1-521
This model from Acer has the 15.6 inch display. It has 4GB RAM and 1TB HDD. You may find the machine to have a good AMD APU Dual Core. Machine has the Linux installed on it. So if you don't want it then you can switch to Windows 10. The machine costs around 18,377 Rs on Amazon. You can check out the machine on Amazon india heree: http://www.amazon.in/Acer-Aspire-ES1-521-NX-G2KSI-024-Diamond/dp/B01C5P1BXM/
Micromax Neo PQC LPQ61407W
This model from Micromax is more suitable as a netbook. Considering it is more lightweight than regular laptop. It has 14.1-inch display. The machine has the Pentium N3700 processor. The machine has the 4GB RAM and 500 GB hard disk. The machine has Windows 10 OS installed. It is a very good laptop at this price. It costs 17,990 Rs on Amazon India. You can find it on this page : http://www.amazon.in/Micromax-LPQ61407W-14-1-inch-Integrated-Graphics/dp/B01KO18NTE/
These are the models that fit your budget and requirement.