18820321164 has 60 divisors (see below), whose sum is σ = 49659942024. Its totient is φ = 6214798656.

The previous prime is 18820321103. The next prime is 18820321181. The reversal of 18820321164 is 46112302881.

18820321164 is a `hidden beast` number, since 188 + 203 + 211 + 64 = 666.

It is a super-2 number, since 2×18820321164² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 236769 + ... + 306104.

Almost surely, 2^18820321164 is an apocalyptic number.

It is an amenable number.

18820321164 is an abundant number, since it is smaller than the sum of its proper divisors (30839620860).

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

18820321164 is a wasteful number, since it uses less digits than its factorization.

18820321164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542996 (or 542985 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 18820321164 in words is "eighteen billion, eight hundred twenty million, three hundred twenty-one thousand, one hundred sixty-four".