31680620 has 12 divisors (see below), whose sum is σ = 66529344. Its totient is φ = 12672240.

The previous prime is 31680587. The next prime is 31680629. The reversal of 31680620 is 2608613.

It is a self number, because there is not a number n which added to its sum of digits gives 31680620.

It is not an unprimeable number, because it can be changed into a prime (31680629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791996 + ... + 792035.

It is an arithmetic number, because the mean of its divisors is an integer number (5544112).

Almost surely, 2^31680620 is an apocalyptic number.

It is an amenable number.

31680620 is an abundant number, since it is smaller than the sum of its proper divisors (34848724).

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

31680620 is a wasteful number, since it uses less digits than its factorization.

31680620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584040 (or 1584038 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 31680620 is about 5628.5539883704. The cubic root of 31680620 is about 316.4204599024.

The spelling of 31680620 in words is "thirty-one million, six hundred eighty thousand, six hundred twenty".