31920196 has 48 divisors (see below), whose sum is σ = 71551872. Its totient is φ = 12096000.

The previous prime is 31920179. The next prime is 31920211. The reversal of 31920196 is 69102913.

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, 9996 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (1490664).

Almost surely, 2^31920196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31920196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35775936).

31920196 is an abundant number, since it is smaller than the sum of its proper divisors (39631676).

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

31920196 is a wasteful number, since it uses less digits than its factorization.

31920196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 31920196 is about 5649.7961025156. The cubic root of 31920196 is about 317.2160720426.

The spelling of 31920196 in words is "thirty-one million, nine hundred twenty thousand, one hundred ninety-six".