18307019520 has 576 divisors, whose sum is σ = 67689431040. Its totient is φ = 4682022912.

The previous prime is 18307019513. The next prime is 18307019557. The reversal of 18307019520 is 2591070381.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-2 number, since 2×18307019520² (a number of 21 digits) contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 144149697 + ... + 144149823.

Almost surely, 2^18307019520 is an apocalyptic number.

18307019520 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 18307019520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33844715520).

18307019520 is an abundant number, since it is smaller than the sum of its proper divisors (49382411520).

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

18307019520 is a wasteful number, since it uses less digits than its factorization.

18307019520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 18307019520 in words is "eighteen billion, three hundred seven million, nineteen thousand, five hundred twenty".