18137690920 has 32 divisors (see below), whose sum is σ = 41268349800. Its totient is φ = 7173557248.

The previous prime is 18137690917. The next prime is 18137690933. The reversal of 18137690920 is 2909673181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9867243556 + 8270447364 = 99334^2 + 90942^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543869 + ... + 2550988.

Almost surely, 2^18137690920 is an apocalyptic number.

18137690920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18137690920 is an abundant number, since it is smaller than the sum of its proper divisors (23130658880).

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

18137690920 is a wasteful number, since it uses less digits than its factorization.

18137690920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094957 (or 5094953 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 18137690920 in words is "eighteen billion, one hundred thirty-seven million, six hundred ninety thousand, nine hundred twenty".