31226920 has 32 divisors (see below), whose sum is σ = 72529920. Its totient is φ = 12087360.

The previous prime is 31226917. The next prime is 31226933. The reversal of 31226920 is 2962213.

It is a happy 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, 11352 + ... + 13831.

It is an arithmetic number, because the mean of its divisors is an integer number (2266560).

Almost surely, 2^31226920 is an apocalyptic number.

It is an amenable number.

31226920 is an abundant number, since it is smaller than the sum of its proper divisors (41303000).

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

31226920 is a wasteful number, since it uses less digits than its factorization.

31226920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25225 (or 25221 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 31226920 is about 5588.1052244925. The cubic root of 31226920 is about 314.9026994347.

The spelling of 31226920 in words is "thirty-one million, two hundred twenty-six thousand, nine hundred twenty".