20857334631 has 16 divisors (see below), whose sum is σ = 31787595264. Its totient is φ = 11916605664.

The previous prime is 20857334623. The next prime is 20857334647. The reversal of 20857334631 is 13643375802.

It is not a de Polignac number, because 20857334631 - 2³ = 20857334623 is a prime.

It is a super-2 number, since 2×20857334631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857334621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65070 + ... + 214356.

It is an arithmetic number, because the mean of its divisors is an integer number (1986724704).

Almost surely, 2^20857334631 is an apocalyptic number.

20857334631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20857334631 is a deficient number, since it is larger than the sum of its proper divisors (10930260633).

20857334631 is a wasteful number, since it uses less digits than its factorization.

20857334631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155950.

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 20857334631 in words is "twenty billion, eight hundred fifty-seven million, three hundred thirty-four thousand, six hundred thirty-one".