220391865 has 48 divisors (see below), whose sum is σ = 411540480. Its totient is φ = 108789120.

The previous prime is 220391827. The next prime is 220391879. The reversal of 220391865 is 568193022.

It is not a de Polignac number, because 220391865 - 2¹⁶ = 220326329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28651 + ... + 35519.

It is an arithmetic number, because the mean of its divisors is an integer number (8573760).

Almost surely, 2^220391865 is an apocalyptic number.

It is an amenable number.

220391865 is a deficient number, since it is larger than the sum of its proper divisors (191148615).

220391865 is a wasteful number, since it uses less digits than its factorization.

220391865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934 (or 6931 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 220391865 is about 14845.6008635555. The cubic root of 220391865 is about 604.0392875706.

The spelling of 220391865 in words is "two hundred twenty million, three hundred ninety-one thousand, eight hundred sixty-five".