18256837920 has 192 divisors, whose sum is σ = 59844718080. Its totient is φ = 4674695168.

The previous prime is 18256837909. The next prime is 18256837943. The reversal of 18256837920 is 2973865281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1188046 + ... + 1203314.

It is an arithmetic number, because the mean of its divisors is an integer number (311691240).

Almost surely, 2^18256837920 is an apocalyptic number.

18256837920 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 18256837920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29922359040).

18256837920 is an abundant number, since it is smaller than the sum of its proper divisors (41587880160).

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

18256837920 is a wasteful number, since it uses less digits than its factorization.

18256837920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15387 (or 15379 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 18256837920 in words is "eighteen billion, two hundred fifty-six million, eight hundred thirty-seven thousand, nine hundred twenty".