20904250 has 16 divisors (see below), whose sum is σ = 39133224. Its totient is φ = 8361600.

The previous prime is 20904227. The next prime is 20904251. The reversal of 20904250 is 5240902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8661249 + 12243001 = 2943^2 + 3499^2 .

It is not an unprimeable number, because it can be changed into a prime (20904251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41559 + ... + 42058.

Almost surely, 2^20904250 is an apocalyptic number.

20904250 is a deficient number, since it is larger than the sum of its proper divisors (18228974).

20904250 is an equidigital number, since it uses as much as digits as its factorization.

20904250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83634 (or 83624 counting only the distinct ones).

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

The square root of 20904250 is about 4572.1165776913. The cubic root of 20904250 is about 275.4724660478.

The spelling of 20904250 in words is "twenty million, nine hundred four thousand, two hundred fifty".