18244065920 has 64 divisors (see below), whose sum is σ = 43632540000. Its totient is φ = 7294645248.

The previous prime is 18244065913. The next prime is 18244065937. The reversal of 18244065920 is 2956044281.

It is a tau number, because it is divible by the number of its divisors (64).

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 7 ways as a sum of consecutive naturals, for example, 2235287 + ... + 2243433.

Almost surely, 2^18244065920 is an apocalyptic number.

18244065920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18244065920 is an abundant number, since it is smaller than the sum of its proper divisors (25388474080).

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

18244065920 is an equidigital number, since it uses as much as digits as its factorization.

18244065920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11665 (or 11653 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 18244065920 in words is "eighteen billion, two hundred forty-four million, sixty-five thousand, nine hundred twenty".