20312992 has 96 divisors (see below), whose sum is σ = 48988800. Its totient is φ = 8107008.

The previous prime is 20312989. The next prime is 20313001. The reversal of 20312992 is 29921302.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 20312992.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 344259 + ... + 344317.

It is an arithmetic number, because the mean of its divisors is an integer number (510300).

Almost surely, 2^20312992 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 20312992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24494400).

20312992 is an abundant number, since it is smaller than the sum of its proper divisors (28675808).

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

20312992 is a wasteful number, since it uses less digits than its factorization.

20312992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20312992 is about 4506.9936764988. The cubic root of 20312992 is about 272.8504236820.

It can be divided in two parts, 203 and 12992, that multiplied together give a square (2637376 = 1624²).

The spelling of 20312992 in words is "twenty million, three hundred twelve thousand, nine hundred ninety-two".