18044233920 has 280 divisors, whose sum is σ = 64536974304. Its totient is φ = 4785537024.

The previous prime is 18044233913. The next prime is 18044233943. The reversal of 18044233920 is 2933244081.

18044233920 is a `hidden beast` number, since 180 + 4 + 423 + 39 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5000757 + ... + 5004363.

Almost surely, 2^18044233920 is an apocalyptic number.

18044233920 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 18044233920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32268487152).

18044233920 is an abundant number, since it is smaller than the sum of its proper divisors (46492740384).

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

18044233920 is a wasteful number, since it uses less digits than its factorization.

18044233920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829 (or 3810 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 18044233920 in words is "eighteen billion, forty-four million, two hundred thirty-three thousand, nine hundred twenty".