18385433220 has 192 divisors, whose sum is σ = 67560192000. Its totient is φ = 3619261440.

The previous prime is 18385433219. The next prime is 18385433233. The reversal of 18385433220 is 2233458381.

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 63 ways as a sum of consecutive naturals, for example, 16945 + ... + 192504.

It is an arithmetic number, because the mean of its divisors is an integer number (351876000).

Almost surely, 2^18385433220 is an apocalyptic number.

18385433220 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 18385433220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33780096000).

18385433220 is an abundant number, since it is smaller than the sum of its proper divisors (49174758780).

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

18385433220 is a wasteful number, since it uses less digits than its factorization.

18385433220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209498 (or 209496 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 18385433220 in words is "eighteen billion, three hundred eighty-five million, four hundred thirty-three thousand, two hundred twenty".