18043685220 has 48 divisors (see below), whose sum is σ = 55115258688. Its totient is φ = 4374226560.

The previous prime is 18043685213. The next prime is 18043685237. The reversal of 18043685220 is 2258634081.

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 15 ways as a sum of consecutive naturals, for example, 13668799 + ... + 13670118.

It is an arithmetic number, because the mean of its divisors is an integer number (1148234556).

Almost surely, 2^18043685220 is an apocalyptic number.

18043685220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18043685220 is an abundant number, since it is smaller than the sum of its proper divisors (37071573468).

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

18043685220 is a wasteful number, since it uses less digits than its factorization.

18043685220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27338940 (or 27338938 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 18043685220 in words is "eighteen billion, forty-three million, six hundred eighty-five thousand, two hundred twenty".