Composition: Typically Nickel Brass, though some from 1969 were Aluminium Bronze.
Mint:
Obverse: Features the Ashoka Lion Capital, with "à¤à¤¾à¤°à¤¤" (Bharat) and "INDIA" on either side.
Reverse: Depicts a lotus blossom with the denomination "20 पैसे PAISE" above and on the sides, and the year of minting (e.g., 1971 in your image) below.