18556020828 has 72 divisors (see below), whose sum is σ = 47746350288. Its totient is φ = 6075326208.

The previous prime is 18556020739. The next prime is 18556020869. The reversal of 18556020828 is 82802065581.

18556020828 is a `hidden beast` number, since 1 + 8 + 5 + 560 + 2 + 0 + 82 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 498976 + ... + 534872.

It is an arithmetic number, because the mean of its divisors is an integer number (663143754).

Almost surely, 2^18556020828 is an apocalyptic number.

18556020828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18556020828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23873175144).

18556020828 is an abundant number, since it is smaller than the sum of its proper divisors (29190329460).

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

18556020828 is a wasteful number, since it uses less digits than its factorization.

18556020828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36163 (or 36158 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The spelling of 18556020828 in words is "eighteen billion, five hundred fifty-six million, twenty thousand, eight hundred twenty-eight".