31102013220 has 24 divisors (see below), whose sum is σ = 87085637184. Its totient is φ = 8293870176.

The previous prime is 31102013183. The next prime is 31102013221. The reversal of 31102013220 is 2231020113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31102013220.

It is not an unprimeable number, because it can be changed into a prime (31102013221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 259183384 + ... + 259183503.

It is an arithmetic number, because the mean of its divisors is an integer number (3628568216).

Almost surely, 2^31102013220 is an apocalyptic number.

31102013220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31102013220 is an abundant number, since it is smaller than the sum of its proper divisors (55983623964).

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

31102013220 is a wasteful number, since it uses less digits than its factorization.

31102013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518366899 (or 518366897 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31102013220 its reverse (2231020113), we get a palindrome (33333033333).

The spelling of 31102013220 in words is "thirty-one billion, one hundred two million, thirteen thousand, two hundred twenty".