20904512 has 14 divisors (see below), whose sum is σ = 41482518. Its totient is φ = 10452224.

The previous prime is 20904511. The next prime is 20904589. The reversal of 20904512 is 21540902.

It can be written as a sum of positive squares in only one way, i.e., 19855936 + 1048576 = 4456^2 + 1024^2 .

It is not an unprimeable number, because it can be changed into a prime (20904511) 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 as a sum of consecutive naturals, namely, 163253 + ... + 163380.

It is an arithmetic number, because the mean of its divisors is an integer number (2963037).

Almost surely, 2^20904512 is an apocalyptic number.

It is an amenable number.

20904512 is a deficient number, since it is larger than the sum of its proper divisors (20578006).

20904512 is an equidigital number, since it uses as much as digits as its factorization.

20904512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326645 (or 326635 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 20904512 is about 4572.1452295394. The cubic root of 20904512 is about 275.4736169060.

The spelling of 20904512 in words is "twenty million, nine hundred four thousand, five hundred twelve".