20557695123 has 24 divisors (see below), whose sum is σ = 33969857376. Its totient is φ = 11735712000.

The previous prime is 20557695121. The next prime is 20557695181. The reversal of 20557695123 is 32159675502.

20557695123 is a `hidden beast` number, since 2 + 0 + 5 + 576 + 9 + 51 + 23 = 666.

It is not a de Polignac number, because 20557695123 - 2¹ = 20557695121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20557695121) 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, 95478 + ... + 224123.

It is an arithmetic number, because the mean of its divisors is an integer number (1415410724).

Almost surely, 2^20557695123 is an apocalyptic number.

20557695123 is a deficient number, since it is larger than the sum of its proper divisors (13412162253).

20557695123 is a wasteful number, since it uses less digits than its factorization.

20557695123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320635 (or 320632 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 20557695123 in words is "twenty billion, five hundred fifty-seven million, six hundred ninety-five thousand, one hundred twenty-three".