MathQuarryCalculators

Primes / Is 20 prime?

Is 20 a Prime Number?

No20 = 2^2 x 5

20 is NOT prime: 2 × 10 = 20. That makes 2 a genuine divisor of 20 beyond 1 and 20 itself. Fully broken down, 20 = 2^2 × 5, for 6 divisors total. 20 sits between primes 19 and 23, 1 below and 3 above. 20: 2, 4, 5, 10 divide 20 evenly, checked against 2-12. 20 is even, digit sum 2 for 20, digital root 2 for 20. 20 has 6 primes within 10 of 20.

Factors
1, 2, 4, 5, 10, 20
Number of factors
6
Prime?
No
Prime factorization
2^2 x 5
Even or odd
Even
Square
400
Cube
8000
Binary
10100
Hexadecimal
14
Roman numeral
XX
Perfect square?
No
Perfect cube?
No
Perfect number?
No
Triangular number?
No
Fibonacci number?
No
Full facts for 20 →Factors of 20 →