31361920 has 32 divisors (see below), whose sum is σ = 74976120. Its totient is φ = 12544512.

The previous prime is 31361917. The next prime is 31361933. The reversal of 31361920 is 2916313.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

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, 23862 + ... + 25141.

Almost surely, 2^31361920 is an apocalyptic number.

It is an amenable number.

31361920 is an abundant number, since it is smaller than the sum of its proper divisors (43614200).

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

31361920 is an equidigital number, since it uses as much as digits as its factorization.

31361920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49022 (or 49010 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 31361920 is about 5600.1714259476. The cubic root of 31361920 is about 315.3558420950.

The spelling of 31361920 in words is "thirty-one million, three hundred sixty-one thousand, nine hundred twenty".