20904236 has 12 divisors (see below), whose sum is σ = 36816528. Its totient is φ = 10385232.

The previous prime is 20904227. The next prime is 20904251. The reversal of 20904236 is 63240902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16016 + ... + 17271.

It is an arithmetic number, because the mean of its divisors is an integer number (3068044).

Almost surely, 2^20904236 is an apocalyptic number.

It is an amenable number.

20904236 is a deficient number, since it is larger than the sum of its proper divisors (15912292).

20904236 is a wasteful number, since it uses less digits than its factorization.

20904236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33448 (or 33446 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 20904236 is about 4572.1150466715. The cubic root of 20904236 is about 275.4724045513.

The spelling of 20904236 in words is "twenty million, nine hundred four thousand, two hundred thirty-six".