218581840220 has 24 divisors (see below), whose sum is σ = 483180910800. Its totient is φ = 82831012992.

The previous prime is 218581840153. The next prime is 218581840247. The reversal of 218581840220 is 22048185812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287607305 + ... + 287608064.

It is an arithmetic number, because the mean of its divisors is an integer number (20132537950).

Almost surely, 2^218581840220 is an apocalyptic number.

218581840220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218581840220 is an abundant number, since it is smaller than the sum of its proper divisors (264599070580).

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

218581840220 is a wasteful number, since it uses less digits than its factorization.

218581840220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575215397 (or 575215395 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 41.

The spelling of 218581840220 in words is "two hundred eighteen billion, five hundred eighty-one million, eight hundred forty thousand, two hundred twenty".