18823990320 has 120 divisors (see below), whose sum is σ = 63344133216. Its totient is φ = 5009654784.

The previous prime is 18823990307. The next prime is 18823990363. The reversal of 18823990320 is 2309932881.

18823990320 is a `hidden beast` number, since 1 + 8 + 8 + 239 + 90 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×18823990320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 336172 + ... + 388148.

Almost surely, 2^18823990320 is an apocalyptic number.

18823990320 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 18823990320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31672066608).

18823990320 is an abundant number, since it is smaller than the sum of its proper divisors (44520142896).

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

18823990320 is a wasteful number, since it uses less digits than its factorization.

18823990320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52499 (or 52490 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 18823990320 in words is "eighteen billion, eight hundred twenty-three million, nine hundred ninety thousand, three hundred twenty".