220391864 has 32 divisors (see below), whose sum is σ = 515203200. Its totient is φ = 85866720.

The previous prime is 220391827. The next prime is 220391879. The reversal of 220391864 is 468193022.

220391864 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 7 ways as a sum of consecutive naturals, for example, 178274 + ... + 179505.

It is an arithmetic number, because the mean of its divisors is an integer number (16100100).

Almost surely, 2^220391864 is an apocalyptic number.

It is an amenable number.

220391864 is an abundant number, since it is smaller than the sum of its proper divisors (294811336).

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

220391864 is a wasteful number, since it uses less digits than its factorization.

220391864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357803 (or 357799 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 220391864 is about 14845.6008298755. The cubic root of 220391864 is about 604.0392866570.

The spelling of 220391864 in words is "two hundred twenty million, three hundred ninety-one thousand, eight hundred sixty-four".