20857715131 has 24 divisors (see below), whose sum is σ = 23646514752. Its totient is φ = 18373872000.

The previous prime is 20857715111. The next prime is 20857715141. The reversal of 20857715131 is 13151775802.

It is not a de Polignac number, because 20857715131 - 2¹³ = 20857706939 is a prime.

It is a super-2 number, since 2×20857715131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20857715111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 556231 + ... + 592543.

It is an arithmetic number, because the mean of its divisors is an integer number (985271448).

Almost surely, 2^20857715131 is an apocalyptic number.

20857715131 is a deficient number, since it is larger than the sum of its proper divisors (2788799621).

20857715131 is a wasteful number, since it uses less digits than its factorization.

20857715131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36483 (or 36472 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 40.

It can be divided in two parts, 2085771 and 5131, that added together give a palindrome (2090902).

The spelling of 20857715131 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, one hundred thirty-one".