20857731125 has 64 divisors (see below), whose sum is σ = 33864929280. Its totient is φ = 12436776000.

The previous prime is 20857731119. The next prime is 20857731133. The reversal of 20857731125 is 52113775802.

It is not a de Polignac number, because 20857731125 - 2⁸ = 20857730869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 174266 + ... + 268484.

It is an arithmetic number, because the mean of its divisors is an integer number (529139520).

Almost surely, 2^20857731125 is an apocalyptic number.

20857731125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20857731125 is a deficient number, since it is larger than the sum of its proper divisors (13007198155).

20857731125 is a wasteful number, since it uses less digits than its factorization.

20857731125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94275 (or 94265 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 41.

The spelling of 20857731125 in words is "twenty billion, eight hundred fifty-seven million, seven hundred thirty-one thousand, one hundred twenty-five".