18933312924 has 72 divisors (see below), whose sum is σ = 49881686400. Its totient is φ = 6279326064.

The previous prime is 18933312901. The next prime is 18933312949. The reversal of 18933312924 is 42921333981.

It is a self number, because there is not a number n which added to its sum of digits gives 18933312924.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144487 + ... + 242369.

It is an arithmetic number, because the mean of its divisors is an integer number (692801200).

Almost surely, 2^18933312924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18933312924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24940843200).

18933312924 is an abundant number, since it is smaller than the sum of its proper divisors (30948373476).

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

18933312924 is a wasteful number, since it uses less digits than its factorization.

18933312924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98101 (or 98087 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The spelling of 18933312924 in words is "eighteen billion, nine hundred thirty-three million, three hundred twelve thousand, nine hundred twenty-four".