20557688875 has 16 divisors (see below), whose sum is σ = 27006314400. Its totient is φ = 15580562400.

The previous prime is 20557688869. The next prime is 20557688953. The reversal of 20557688875 is 57888675502.

It is not a de Polignac number, because 20557688875 - 2³³ = 11967754283 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4325560 + ... + 4330309.

It is an arithmetic number, because the mean of its divisors is an integer number (1687894650).

Almost surely, 2^20557688875 is an apocalyptic number.

20557688875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20557688875 is a deficient number, since it is larger than the sum of its proper divisors (6448625525).

20557688875 is an equidigital number, since it uses as much as digits as its factorization.

20557688875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8655903 (or 8655893 counting only the distinct ones).

The product of its (nonzero) digits is 37632000, while the sum is 61.

The spelling of 20557688875 in words is "twenty billion, five hundred fifty-seven million, six hundred eighty-eight thousand, eight hundred seventy-five".