31797220 has 48 divisors (see below), whose sum is σ = 82188288. Its totient is φ = 10062720.

The previous prime is 31797193. The next prime is 31797221. The reversal of 31797220 is 2279713.

It is a super-2 number, since 2×31797220² = 2022126399456800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31797221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6916 + ... + 10555.

It is an arithmetic number, because the mean of its divisors is an integer number (1712256).

Almost surely, 2^31797220 is an apocalyptic number.

It is an amenable number.

31797220 is an abundant number, since it is smaller than the sum of its proper divisors (50391068).

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

31797220 is a wasteful number, since it uses less digits than its factorization.

31797220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17500 (or 17498 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 31797220 is about 5638.9023754628. The cubic root of 31797220 is about 316.8081780573.

The spelling of 31797220 in words is "thirty-one million, seven hundred ninety-seven thousand, two hundred twenty".