31420644 has 12 divisors (see below), whose sum is σ = 73314864. Its totient is φ = 10473544.

The previous prime is 31420621. The next prime is 31420651. The reversal of 31420644 is 44602413.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309182 + ... + 1309205.

It is an arithmetic number, because the mean of its divisors is an integer number (6109572).

Almost surely, 2^31420644 is an apocalyptic number.

It is an amenable number.

31420644 is an abundant number, since it is smaller than the sum of its proper divisors (41894220).

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

31420644 is a wasteful number, since it uses less digits than its factorization.

31420644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618394 (or 2618392 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 31420644 is about 5605.4120276747. The cubic root of 31420644 is about 315.5525499688.

The spelling of 31420644 in words is "thirty-one million, four hundred twenty thousand, six hundred forty-four".