20304172 has 12 divisors (see below), whose sum is σ = 40608400. Its totient is φ = 8701776.

The previous prime is 20304161. The next prime is 20304173. The reversal of 20304172 is 27140302.

20304172 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20304173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362547 + ... + 362602.

Almost surely, 2^20304172 is an apocalyptic number.

It is an amenable number.

20304172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20304172 is a wasteful number, since it uses less digits than its factorization.

20304172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725160 (or 725158 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20304172 is about 4506.0150909645. The cubic root of 20304172 is about 272.8109269709.

Adding to 20304172 its reverse (27140302), we get a palindrome (47444474).

The spelling of 20304172 in words is "twenty million, three hundred four thousand, one hundred seventy-two".