20312940 has 48 divisors (see below), whose sum is σ = 57159648. Its totient is φ = 5389824.

The previous prime is 20312923. The next prime is 20312951. The reversal of 20312940 is 4921302.

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, 13254 + ... + 14706.

It is an arithmetic number, because the mean of its divisors is an integer number (1190826).

Almost surely, 2^20312940 is an apocalyptic number.

20312940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312940 is an abundant number, since it is smaller than the sum of its proper divisors (36846708).

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

20312940 is a wasteful number, since it uses less digits than its factorization.

20312940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698 (or 1696 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20312940 is about 4506.9879076829. The cubic root of 20312940 is about 272.8501908551.

The spelling of 20312940 in words is "twenty million, three hundred twelve thousand, nine hundred forty".