18738223320 has 256 divisors, whose sum is σ = 60230016000. Its totient is φ = 4650172416.

The previous prime is 18738223319. The next prime is 18738223331. The reversal of 18738223320 is 2332283781.

It is a super-2 number, since 2×18738223320² (a number of 21 digits) contains 22 as substring.

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, 42683661 + ... + 42684099.

It is an arithmetic number, because the mean of its divisors is an integer number (235273500).

Almost surely, 2^18738223320 is an apocalyptic number.

18738223320 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 18738223320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30115008000).

18738223320 is an abundant number, since it is smaller than the sum of its proper divisors (41491792680).

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

18738223320 is a wasteful number, since it uses less digits than its factorization.

18738223320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 18738223320 in words is "eighteen billion, seven hundred thirty-eight million, two hundred twenty-three thousand, three hundred twenty".