31320980 has 12 divisors (see below), whose sum is σ = 65774100. Its totient is φ = 12528384.

The previous prime is 31320977. The next prime is 31320997. The reversal of 31320980 is 8902313.

It can be written as a sum of positive squares in 2 ways, for example, as 6739216 + 24581764 = 2596^2 + 4958^2 .

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, 783005 + ... + 783044.

It is an arithmetic number, because the mean of its divisors is an integer number (5481175).

Almost surely, 2^31320980 is an apocalyptic number.

It is an amenable number.

31320980 is an abundant number, since it is smaller than the sum of its proper divisors (34453120).

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

31320980 is a wasteful number, since it uses less digits than its factorization.

31320980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566058 (or 1566056 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 31320980 is about 5596.5149870254. The cubic root of 31320980 is about 315.2185600012.

The spelling of 31320980 in words is "thirty-one million, three hundred twenty thousand, nine hundred eighty".