18331320240 has 120 divisors (see below), whose sum is σ = 62304606000. Its totient is φ = 4829440512.

The previous prime is 18331320221. The next prime is 18331320247. The reversal of 18331320240 is 4202313381.

18331320240 is a `hidden beast` number, since 1 + 8 + 331 + 320 + 2 + 4 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (18331320247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93615 + ... + 213134.

It is an arithmetic number, because the mean of its divisors is an integer number (519205050).

Almost surely, 2^18331320240 is an apocalyptic number.

18331320240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18331320240 is an abundant number, since it is smaller than the sum of its proper divisors (43973285760).

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

18331320240 is a wasteful number, since it uses less digits than its factorization.

18331320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306851 (or 306842 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 18331320240 in words is "eighteen billion, three hundred thirty-one million, three hundred twenty thousand, two hundred forty".