20502904 has 32 divisors (see below), whose sum is σ = 40550400. Its totient is φ = 9704160.

The previous prime is 20502887. The next prime is 20502907. The reversal of 20502904 is 40920502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502907) 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 7 ways as a sum of consecutive naturals, for example, 10777 + ... + 12535.

It is an arithmetic number, because the mean of its divisors is an integer number (1267200).

Almost surely, 2^20502904 is an apocalyptic number.

It is an amenable number.

20502904 is a deficient number, since it is larger than the sum of its proper divisors (20047496).

20502904 is a wasteful number, since it uses less digits than its factorization.

20502904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843 (or 1839 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20502904 is about 4528.0132508640. The cubic root of 20502904 is about 273.6981064106.

The spelling of 20502904 in words is "twenty million, five hundred two thousand, nine hundred four".