18520706900 has 72 divisors (see below), whose sum is σ = 40998563424. Its totient is φ = 7259574400.

The previous prime is 18520706891. The next prime is 18520706903. The reversal of 18520706900 is 960702581.

It is a super-2 number, since 2×18520706900² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520706903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5780699 + ... + 5783901.

It is an arithmetic number, because the mean of its divisors is an integer number (569424492).

Almost surely, 2^18520706900 is an apocalyptic number.

18520706900 is a gapful number since it is divisible by the number (10) 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 18520706900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20499281712).

18520706900 is an abundant number, since it is smaller than the sum of its proper divisors (22477856524).

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

18520706900 is a wasteful number, since it uses less digits than its factorization.

18520706900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4361 (or 4354 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 18520706900 in words is "eighteen billion, five hundred twenty million, seven hundred six thousand, nine hundred".