218822220 has 36 divisors (see below), whose sum is σ = 663761280. Its totient is φ = 58352544.

The previous prime is 218822173. The next prime is 218822231. The reversal of 218822220 is 22228812.

218822220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 607660 + ... + 608019.

Almost surely, 2^218822220 is an apocalyptic number.

218822220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218822220 is an abundant number, since it is smaller than the sum of its proper divisors (444939060).

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

218822220 is a wasteful number, since it uses less digits than its factorization.

218822220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215694 (or 1215689 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 218822220 is about 14792.6407378804. The cubic root of 218822220 is about 602.6018675000.

The spelling of 218822220 in words is "two hundred eighteen million, eight hundred twenty-two thousand, two hundred twenty".