Definition of Decimal Number System: The decimal number system is the base-10 number system. It uses the ten digits, from 0 to 9.
The decimal numbers are the most widely used in daily life all over the world.
Base-20 (also known as vigesimal) number system uses 20 symbols to code information. Most commonly, these symbols are, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and 'A to J' (or alternatively 'a to j').