20128504 has 16 divisors (see below), whose sum is σ = 41172120. Its totient is φ = 9149280.

The previous prime is 20128501. The next prime is 20128513. The reversal of 20128504 is 40582102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128501) 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, 114279 + ... + 114454.

Almost surely, 2^20128504 is an apocalyptic number.

It is an amenable number.

20128504 is an abundant number, since it is smaller than the sum of its proper divisors (21043616).

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

20128504 is a wasteful number, since it uses less digits than its factorization.

20128504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228750 (or 228746 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20128504 is about 4486.4801348050. The cubic root of 20128504 is about 272.0218768448.

The spelling of 20128504 in words is "twenty million, one hundred twenty-eight thousand, five hundred four".