220989918 has 32 divisors (see below), whose sum is σ = 468387360. Its totient is φ = 69386240.

The previous prime is 220989871. The next prime is 220989929. The reversal of 220989918 is 819989022.

220989918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 8355 + ... + 22622.

It is an arithmetic number, because the mean of its divisors is an integer number (14637105).

Almost surely, 2^220989918 is an apocalyptic number.

220989918 is an abundant number, since it is smaller than the sum of its proper divisors (247397442).

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

220989918 is a wasteful number, since it uses less digits than its factorization.

220989918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31052.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 220989918 is about 14865.7296490956. The cubic root of 220989918 is about 604.5851656148.

The spelling of 220989918 in words is "two hundred twenty million, nine hundred eighty-nine thousand, nine hundred eighteen".