31444920 has 96 divisors (see below), whose sum is σ = 110073600. Its totient is φ = 7739136.

The previous prime is 31444901. The next prime is 31444937. The reversal of 31444920 is 2944413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1321 + ... + 8039.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^31444920 is an apocalyptic number.

31444920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31444920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55036800).

31444920 is an abundant number, since it is smaller than the sum of its proper divisors (78628680).

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

31444920 is a wasteful number, since it uses less digits than its factorization.

31444920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6749 (or 6742 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 31444920 is about 5607.5770168585. The cubic root of 31444920 is about 315.6337957226.

The spelling of 31444920 in words is "thirty-one million, four hundred forty-four thousand, nine hundred twenty".