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').
Definition of Hexadecimal Number System: The hexadecimal (also base-16 or simply hex) number system is a positional numeral system that represents numbers using a base of 16. Unlike the decimal system representing numbers using 10 symbols, hexadecimal uses 16 distinct symbols, most often the symbols '0–9' to represent values 0 to 9, and 'A–F' (or alternatively 'a–f') to represent values from 10 to 15.