18223201238820 has 48 divisors (see below), whose sum is σ = 53243440145280. Its totient is φ = 4648236837376.

The previous prime is 18223201238819. The next prime is 18223201238839. The reversal of 18223201238820 is 2883210232281.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6602607765 + ... + 6602610524.

It is an arithmetic number, because the mean of its divisors is an integer number (1109238336360).

Almost surely, 2^{18223201238820} is an apocalyptic number.

18223201238820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18223201238820 is an abundant number, since it is smaller than the sum of its proper divisors (35020238906460).

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

18223201238820 is a wasteful number, since it uses less digits than its factorization.

18223201238820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13205218324 (or 13205218322 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The spelling of 18223201238820 in words is "eighteen trillion, two hundred twenty-three billion, two hundred one million, two hundred thirty-eight thousand, eight hundred twenty".