18944003520 has 448 divisors, whose sum is σ = 72385367040. Its totient is φ = 4636348416.

The previous prime is 18944003489. The next prime is 18944003563. The reversal of 18944003520 is 2530044981.

18944003520 is a `hidden beast` number, since 1 + 8 + 94 + 40 + 0 + 3 + 520 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25496269 + ... + 25497011.

It is an arithmetic number, because the mean of its divisors is an integer number (161574480).

Almost surely, 2^18944003520 is an apocalyptic number.

18944003520 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 18944003520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36192683520).

18944003520 is an abundant number, since it is smaller than the sum of its proper divisors (53441363520).

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

18944003520 is a wasteful number, since it uses less digits than its factorization.

18944003520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 18944003520 in words is "eighteen billion, nine hundred forty-four million, three thousand, five hundred twenty".