31032113220 has 72 divisors (see below), whose sum is σ = 94145729496. Its totient is φ = 8273912832.

The previous prime is 31032113213. The next prime is 31032113311. The reversal of 31032113220 is 2231123013.

31032113220 is a `hidden beast` number, since 310 + 32 + 1 + 1 + 322 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15832182276 + 15199930944 = 125826^2 + 123288^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31032113193 and 31032113202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1743084 + ... + 1760796.

Almost surely, 2^31032113220 is an apocalyptic number.

31032113220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31032113220 is an abundant number, since it is smaller than the sum of its proper divisors (63113616276).

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

31032113220 is a wasteful number, since it uses less digits than its factorization.

31032113220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27461 (or 27456 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31032113220 its reverse (2231123013), we get a palindrome (33263236233).

The spelling of 31032113220 in words is "thirty-one billion, thirty-two million, one hundred thirteen thousand, two hundred twenty".