Names of 20
| Nominal | 20 |
| Cardinal | twenty |
| Ordinal | 20th |
| This number as US currency | twenty dollars |
| Is 20 an odd number? | 20 is NOT an odd number |
| Is 20 an even number? | 20 is an even number |
| Is 20 a palindrome? | 20 is NOT a palindrome number |
| Is 20 a triangle number? | 20 is NOT a triangle number |
20 in other Bases
| Base 2 (Binary) | 101002 |
| Base 3 (Ternary) | 2023 |
| Base 4 (Quaternary) | 1104 |
| Base 5 (Quinary) | 405 |
| Base 6 (Senary) | 326 |
| Base 8 (Octal) | 248 |
| Base 12 (Duodecimal) | 1812 |
| Base 16 (Hexadecimal) | 1416 |
| Base 20 (Vigesimal) | 1020 |
Primes and Factors tests for 20
| Is 20 a Prime Number? | 20 is NOT a prime |
| Is 20 a perfect number? | 20 is NOT a perfect number |
| Is 20 a Mersenne Prime? | 20 is NOT a Mersenne prime |
| Is 20 a Fermat Prime? | 20 is NOT a Fermat prime |
| Is 20 a Fibonacci Prime? | 20 is NOT a Fibonacci prime |
| Is 20 a Partition Prime? | 20 is NOT a Partition prime |
| Is 20 a Pell Prime? | 20 is NOT a Pell prime |
| Prime Factors | Prime factors of 20 |
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20 in other Numerals
| 20 in Roman Numeral | XX |
| 20 in Chinese Numeral | 貳拾 |
| 20 in Egyptian Numeral | 𓎇 |
| 20 in Babylonian Numeral |  |
Roots and stuff for 20
| Is 20 a square number? | 20 is NOT a square number |
| Is 20 a cube number? | 20 is NOT a cube number |
| Square root of the number 20 | 4.4721359549996 |
| Cube root of the number 20 | 2.7144176165949 |
Recreational math for 20
| Number 20 reversed | 02 |
| Sum of the digits | 2 |
| No of digits | 2 |