18039977220 has 96 divisors (see below), whose sum is σ = 52311168000. Its totient is φ = 4639670784.

The previous prime is 18039977183. The next prime is 18039977231. The reversal of 18039977220 is 2277993081.

It is a self number, because there is not a number n which added to its sum of digits gives 18039977220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1729581 + ... + 1739979.

It is an arithmetic number, because the mean of its divisors is an integer number (544908000).

Almost surely, 2^18039977220 is an apocalyptic number.

18039977220 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 18039977220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26155584000).

18039977220 is an abundant number, since it is smaller than the sum of its proper divisors (34271190780).

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

18039977220 is a wasteful number, since it uses less digits than its factorization.

18039977220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11437 (or 11435 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 18039977220 in words is "eighteen billion, thirty-nine million, nine hundred seventy-seven thousand, two hundred twenty".