218335220 has 12 divisors (see below), whose sum is σ = 458504004. Its totient is φ = 87334080.

The previous prime is 218335217. The next prime is 218335253. The reversal of 218335220 is 22533812.

218335220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 146797456 + 71537764 = 12116^2 + 8458^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 218335220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5458361 + ... + 5458400.

It is an arithmetic number, because the mean of its divisors is an integer number (38208667).

Almost surely, 2^218335220 is an apocalyptic number.

218335220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218335220 is an abundant number, since it is smaller than the sum of its proper divisors (240168784).

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

218335220 is a wasteful number, since it uses less digits than its factorization.

218335220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10916770 (or 10916768 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 218335220 is about 14776.1706812015. The cubic root of 218335220 is about 602.1544950657.

The spelling of 218335220 in words is "two hundred eighteen million, three hundred thirty-five thousand, two hundred twenty".