20
Everything about the number 20 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 20
| Nominal | 20 |
| Cardinal | twenty |
| Ordinal | 20th |
| This number as US currency | twenty dollars |
Properties (and some facts) of 20
| 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 |
| Is 20 a triangle number? | 20 is not a triangle number |
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20 in other bases
| Base 2 (Binary) | 10100 |
| Base 3 (Ternary) | 202 |
| Base 4 (Quaternary) | 110 |
| Base 5 (Quinary) | 40 |
| Base 6 (Senary) | 32 |
| Base 8 (Octal) | 24 |
| Base 12 (Duodecimal) | 18 |
| Base 16 (Hexadecimal) | 14 |
| Base 20 (Vigesimal) | 10 |
Primes and factors tests for 20
| Is 20 a prime number? | 20 is not a prime number |
| 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 |
20 in other numeral systems
| 20 in Roman numerals | XX |
| 20 in Chinese numerals | 貳拾 |
| 20 in Babylonian numerals |  |
| 20 in Egyptian numerals | 𓎇 |
Roots and squares 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 20 | 4.4721359549996 |
| Cube root of 20 | 2.7144176165949 |
Recreational math for 20
| Number 20 reversed | 02 |
| Sum of the digits | 2 |
| Number of digits | 2 |
Arithmetic tables for 20
Other pages about 20
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