31920868 has 24 divisors (see below), whose sum is σ = 64433600. Its totient is φ = 13553568.

The previous prime is 31920859. The next prime is 31920869. The reversal of 31920868 is 86802913.

It is not an unprimeable number, because it can be changed into a prime (31920869) by changing a digit.

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, 2178 + ... + 8281.

Almost surely, 2^31920868 is an apocalyptic number.

It is an amenable number.

31920868 is an abundant number, since it is smaller than the sum of its proper divisors (32512732).

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

31920868 is a wasteful number, since it uses less digits than its factorization.

31920868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579 (or 10577 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 31920868 is about 5649.8555733753. The cubic root of 31920868 is about 317.2182980910.

The spelling of 31920868 in words is "thirty-one million, nine hundred twenty thousand, eight hundred sixty-eight".