20957499475902 has 48 divisors (see below), whose sum is σ = 49580818530048. Its totient is φ = 6344999637840.

The previous prime is 20957499475897. The next prime is 20957499475903.

20957499475902 is a `hidden beast` number, since 2 + 0 + 9 + 5 + 7 + 499 + 47 + 5 + 90 + 2 = 666.

20957499475902 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20957499475903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47762548 + ... + 48199335.

It is an arithmetic number, because the mean of its divisors is an integer number (1032933719376).

Almost surely, 2^{20957499475902} is an apocalyptic number.

20957499475902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20957499475902 is an abundant number, since it is smaller than the sum of its proper divisors (28623319054146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20957499475902 is a wasteful number, since it uses less digits than its factorization.

20957499475902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95963005 (or 95963002 counting only the distinct ones).

The product of its (nonzero) digits is 514382400, while the sum is 72.

The spelling of 20957499475902 in words is "twenty trillion, nine hundred fifty-seven billion, four hundred ninety-nine million, four hundred seventy-five thousand, nine hundred two".