18423073920 has 128 divisors (see below), whose sum is σ = 58761792000. Its totient is φ = 4909621248.

The previous prime is 18423073891. The next prime is 18423073931. The reversal of 18423073920 is 2937032481.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5218716 + ... + 5222244.

It is an arithmetic number, because the mean of its divisors is an integer number (459076500).

Almost surely, 2^18423073920 is an apocalyptic number.

18423073920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18423073920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29380896000).

18423073920 is an abundant number, since it is smaller than the sum of its proper divisors (40338718080).

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

18423073920 is a wasteful number, since it uses less digits than its factorization.

18423073920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6270 (or 6258 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 18423073920 in words is "eighteen billion, four hundred twenty-three million, seventy-three thousand, nine hundred twenty".