20311904 has 12 divisors (see below), whose sum is σ = 39989124. Its totient is φ = 10155936.

The previous prime is 20311903. The next prime is 20311937. The reversal of 20311904 is 40911302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317342 + ... + 317405.

It is an arithmetic number, because the mean of its divisors is an integer number (3332427).

Almost surely, 2^20311904 is an apocalyptic number.

It is an amenable number.

20311904 is a deficient number, since it is larger than the sum of its proper divisors (19677220).

20311904 is an equidigital number, since it uses as much as digits as its factorization.

20311904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634757 (or 634749 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20311904 is about 4506.8729735816. The cubic root of 20311904 is about 272.8455521437.

The spelling of 20311904 in words is "twenty million, three hundred eleven thousand, nine hundred four".