18201806920 has 64 divisors (see below), whose sum is σ = 45344059200. Its totient is φ = 6520039680.

The previous prime is 18201806893. The next prime is 18201806927. The reversal of 18201806920 is 2960810281.

It is a self number, because there is not a number n which added to its sum of digits gives 18201806920.

It is not an unprimeable number, because it can be changed into a prime (18201806927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279235 + ... + 338194.

It is an arithmetic number, because the mean of its divisors is an integer number (708500925).

Almost surely, 2^18201806920 is an apocalyptic number.

18201806920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18201806920 is an abundant number, since it is smaller than the sum of its proper divisors (27142252280).

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

18201806920 is a wasteful number, since it uses less digits than its factorization.

18201806920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617518 (or 617514 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 18201806920 in words is "eighteen billion, two hundred one million, eight hundred six thousand, nine hundred twenty".