18354988920 has 64 divisors (see below), whose sum is σ = 55461168000. Its totient is φ = 4859445888.

The previous prime is 18354988909. The next prime is 18354988921. The reversal of 18354988920 is 2988945381.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18354988921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 533530 + ... + 566889.

It is an arithmetic number, because the mean of its divisors is an integer number (866580750).

Almost surely, 2^18354988920 is an apocalyptic number.

18354988920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18354988920 is an abundant number, since it is smaller than the sum of its proper divisors (37106179080).

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

18354988920 is a wasteful number, since it uses less digits than its factorization.

18354988920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100572 (or 1100568 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 57.

The spelling of 18354988920 in words is "eighteen billion, three hundred fifty-four million, nine hundred eighty-eight thousand, nine hundred twenty".