20428504 has 16 divisors (see below), whose sum is σ = 39539520. Its totient is φ = 9884640.

The previous prime is 20428489. The next prime is 20428511. The reversal of 20428504 is 40582402.

It is a happy number.

It is a congruent number.

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, 40939 + ... + 41434.

It is an arithmetic number, because the mean of its divisors is an integer number (2471220).

Almost surely, 2^20428504 is an apocalyptic number.

It is an amenable number.

20428504 is a deficient number, since it is larger than the sum of its proper divisors (19111016).

20428504 is a wasteful number, since it uses less digits than its factorization.

20428504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82410 (or 82406 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 20428504 is about 4519.7902606205. The cubic root of 20428504 is about 273.3666440995.

The spelling of 20428504 in words is "twenty million, four hundred twenty-eight thousand, five hundred four".