31916920 has 32 divisors (see below), whose sum is σ = 82072800. Its totient is φ = 10942848.

The previous prime is 31916897. The next prime is 31916947. The reversal of 31916920 is 2961913.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56715 + ... + 57274.

It is an arithmetic number, because the mean of its divisors is an integer number (2564775).

Almost surely, 2^31916920 is an apocalyptic number.

It is an amenable number.

31916920 is an abundant number, since it is smaller than the sum of its proper divisors (50155880).

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

31916920 is a wasteful number, since it uses less digits than its factorization.

31916920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114007 (or 114003 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 31916920 is about 5649.5061731093. The cubic root of 31916920 is about 317.2052196091.

The spelling of 31916920 in words is "thirty-one million, nine hundred sixteen thousand, nine hundred twenty".