18338887220 has 48 divisors (see below), whose sum is σ = 39501982800. Its totient is φ = 7148783616.

The previous prime is 18338887219. The next prime is 18338887291. The reversal of 18338887220 is 2278883381.

It can be written as a sum of positive squares in 8 ways, for example, as 692952976 + 17645934244 = 26324^2 + 132838^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99884 + ... + 215996.

It is an arithmetic number, because the mean of its divisors is an integer number (822957975).

Almost surely, 2^18338887220 is an apocalyptic number.

18338887220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18338887220 is an abundant number, since it is smaller than the sum of its proper divisors (21163095580).

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

18338887220 is a wasteful number, since it uses less digits than its factorization.

18338887220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116324 (or 116322 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 18338887220 in words is "eighteen billion, three hundred thirty-eight million, eight hundred eighty-seven thousand, two hundred twenty".