20504664331 has 2 divisors, whose sum is σ = 20504664332. Its totient is φ = 20504664330.

The previous prime is 20504664311. The next prime is 20504664347. The reversal of 20504664331 is 13346640502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20504664331 is a prime.

It is a super-2 number, since 2×20504664331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20504664311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252332165 + 10252332166.

It is an arithmetic number, because the mean of its divisors is an integer number (10252332166).

Almost surely, 2^20504664331 is an apocalyptic number.

20504664331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504664331 is an equidigital number, since it uses as much as digits as its factorization.

20504664331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 20504664331 in words is "twenty billion, five hundred four million, six hundred sixty-four thousand, three hundred thirty-one".