20256959 has 2 divisors, whose sum is σ = 20256960. Its totient is φ = 20256958.

The previous prime is 20256949. The next prime is 20256967. The reversal of 20256959 is 95965202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20256959 - 2¹² = 20252863 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20256949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128479 + 10128480.

It is an arithmetic number, because the mean of its divisors is an integer number (10128480).

Almost surely, 2^20256959 is an apocalyptic number.

20256959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20256959 is an equidigital number, since it uses as much as digits as its factorization.

20256959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 20256959 is about 4500.7731558033. The cubic root of 20256959 is about 272.5993084160.

The spelling of 20256959 in words is "twenty million, two hundred fifty-six thousand, nine hundred fifty-nine".