31320268920 has 128 divisors (see below), whose sum is σ = 110542190400. Its totient is φ = 7860768768.

The previous prime is 31320268913. The next prime is 31320268997. The reversal of 31320268920 is 2986202313.

It is a super-2 number, since 2×31320268920² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 834589 + ... + 871308.

Almost surely, 2^31320268920 is an apocalyptic number.

31320268920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31320268920 is an abundant number, since it is smaller than the sum of its proper divisors (79221921480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31320268920 is a wasteful number, since it uses less digits than its factorization.

31320268920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705934 (or 1705924 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 31320268920 in words is "thirty-one billion, three hundred twenty million, two hundred sixty-eight thousand, nine hundred twenty".