31031123023220 has 48 divisors (see below), whose sum is σ = 65531898633600. Its totient is φ = 12342637280640.

The previous prime is 31031123023213. The next prime is 31031123023259. The reversal of 31031123023220 is 2232032113013.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 103208066 + ... + 103508294.

It is an arithmetic number, because the mean of its divisors is an integer number (1365247888200).

Almost surely, 2^{31031123023220} is an apocalyptic number.

It is an amenable number.

31031123023220 is an abundant number, since it is smaller than the sum of its proper divisors (34500775610380).

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

31031123023220 is a wasteful number, since it uses less digits than its factorization.

31031123023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329288 (or 329286 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31031123023220 its reverse (2232032113013), we get a palindrome (33263155136233).

The spelling of 31031123023220 in words is "thirty-one trillion, thirty-one billion, one hundred twenty-three million, twenty-three thousand, two hundred twenty".