20504959 has 2 divisors, whose sum is σ = 20504960. Its totient is φ = 20504958.

The previous prime is 20504923. The next prime is 20504963. The reversal of 20504959 is 95940502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20504959 - 2¹⁵ = 20472191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20504909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252479 + 10252480.

It is an arithmetic number, because the mean of its divisors is an integer number (10252480).

Almost surely, 2^20504959 is an apocalyptic number.

20504959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504959 is an equidigital number, since it uses as much as digits as its factorization.

20504959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 20504959 is about 4528.2401658923. The cubic root of 20504959 is about 273.7072503319.

The spelling of 20504959 in words is "twenty million, five hundred four thousand, nine hundred fifty-nine".