18220805604 has 24 divisors (see below), whose sum is σ = 47239125920. Its totient is φ = 6073601832.

The previous prime is 18220805587. The next prime is 18220805609. The reversal of 18220805604 is 40650802281.

18220805604 is a `hidden beast` number, since 18 + 2 + 2 + 0 + 80 + 560 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18220805609) 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, 84355474 + ... + 84355689.

Almost surely, 2^18220805604 is an apocalyptic number.

It is an amenable number.

18220805604 is an abundant number, since it is smaller than the sum of its proper divisors (29018320316).

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

18220805604 is a wasteful number, since it uses less digits than its factorization.

18220805604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168711176 (or 168711168 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The spelling of 18220805604 in words is "eighteen billion, two hundred twenty million, eight hundred five thousand, six hundred four".