18018018920 has 32 divisors (see below), whose sum is σ = 44226047520. Its totient is φ = 6552006720.

The previous prime is 18018018901. The next prime is 18018018937. The reversal of 18018018920 is 2981081081.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

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, 20474582 + ... + 20475461.

It is an arithmetic number, because the mean of its divisors is an integer number (1382063985).

Almost surely, 2^18018018920 is an apocalyptic number.

18018018920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18018018920 is an abundant number, since it is smaller than the sum of its proper divisors (26208028600).

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

18018018920 is a wasteful number, since it uses less digits than its factorization.

18018018920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40950065 (or 40950061 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 38.

The spelling of 18018018920 in words is "eighteen billion, eighteen million, eighteen thousand, nine hundred twenty".