31274220 has 48 divisors (see below), whose sum is σ = 92721888. Its totient is φ = 7848960.

The previous prime is 31274183. The next prime is 31274263. The reversal of 31274220 is 2247213.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14311 + ... + 16350.

It is an arithmetic number, because the mean of its divisors is an integer number (1931706).

Almost surely, 2^31274220 is an apocalyptic number.

31274220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31274220 is an abundant number, since it is smaller than the sum of its proper divisors (61447668).

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

31274220 is a wasteful number, since it uses less digits than its factorization.

31274220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30690 (or 30688 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 31274220 is about 5592.3358268259. The cubic root of 31274220 is about 315.0616155609.

The spelling of 31274220 in words is "thirty-one million, two hundred seventy-four thousand, two hundred twenty".