18051037920 has 240 divisors, whose sum is σ = 67453304688. Its totient is φ = 4530401280.

The previous prime is 18051037841. The next prime is 18051037943. The reversal of 18051037920 is 2973015081.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 179355 + ... + 261285.

Almost surely, 2^18051037920 is an apocalyptic number.

18051037920 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 18051037920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33726652344).

18051037920 is an abundant number, since it is smaller than the sum of its proper divisors (49402266768).

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

18051037920 is a wasteful number, since it uses less digits than its factorization.

18051037920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81975 (or 81958 counting only the distinct ones).

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

The spelling of 18051037920 in words is "eighteen billion, fifty-one million, thirty-seven thousand, nine hundred twenty".