31031310220 has 48 divisors (see below), whose sum is σ = 69234863040. Its totient is φ = 11660592384.

The previous prime is 31031310187. The next prime is 31031310239. The reversal of 31031310220 is 2201313013.

It is a junction number, because it is equal to n+sod(n) for n = 31031310194 and 31031310203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 701544 + ... + 744463.

It is an arithmetic number, because the mean of its divisors is an integer number (1442392980).

Almost surely, 2^31031310220 is an apocalyptic number.

It is an amenable number.

31031310220 is an abundant number, since it is smaller than the sum of its proper divisors (38203552820).

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

31031310220 is a wasteful number, since it uses less digits than its factorization.

31031310220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446082 (or 1446080 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31031310220 its reverse (2201313013), we get a palindrome (33232623233).

The spelling of 31031310220 in words is "thirty-one billion, thirty-one million, three hundred ten thousand, two hundred twenty".