31293920 has 48 divisors (see below), whose sum is σ = 84496608. Its totient is φ = 10728960.

The previous prime is 31293919. The next prime is 31293937. The reversal of 31293920 is 2939213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12851 + ... + 15090.

It is an arithmetic number, because the mean of its divisors is an integer number (1760346).

Almost surely, 2^31293920 is an apocalyptic number.

It is an amenable number.

31293920 is an abundant number, since it is smaller than the sum of its proper divisors (53202688).

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

31293920 is a wasteful number, since it uses less digits than its factorization.

31293920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27963 (or 27955 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 31293920 is about 5594.0968886854. The cubic root of 31293920 is about 315.1277553512.

The spelling of 31293920 in words is "thirty-one million, two hundred ninety-three thousand, nine hundred twenty".