18620136972 has 36 divisors (see below), whose sum is σ = 47202464400. Its totient is φ = 6188923872.

The previous prime is 18620136961. The next prime is 18620136973. The reversal of 18620136972 is 27963102681.

18620136972 is a `hidden beast` number, since 1 + 8 + 620 + 13 + 6 + 9 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18620136973) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 728448 + ... + 753575.

Almost surely, 2^18620136972 is an apocalyptic number.

18620136972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18620136972 is an abundant number, since it is smaller than the sum of its proper divisors (28582327428).

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

18620136972 is a wasteful number, since it uses less digits than its factorization.

18620136972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482382 (or 1482377 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 18620136972 in words is "eighteen billion, six hundred twenty million, one hundred thirty-six thousand, nine hundred seventy-two".