18052538920 has 32 divisors (see below), whose sum is σ = 43742691720. Its totient is φ = 6665552640.

The previous prime is 18052538899. The next prime is 18052538923. The reversal of 18052538920 is 2983525081.

It can be written as a sum of positive squares in 4 ways, for example, as 16491182724 + 1561356196 = 128418^2 + 39514^2 .

It is a super-2 number, since 2×18052538920² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18052538923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17357691 + ... + 17358730.

Almost surely, 2^18052538920 is an apocalyptic number.

18052538920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18052538920 is an abundant number, since it is smaller than the sum of its proper divisors (25690152800).

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

18052538920 is a wasteful number, since it uses less digits than its factorization.

18052538920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34716445 (or 34716441 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 18052538920 in words is "eighteen billion, fifty-two million, five hundred thirty-eight thousand, nine hundred twenty".