220565 has 8 divisors (see below), whose sum is σ = 273408. Its totient is φ = 170640.

The previous prime is 220559. The next prime is 220573. The reversal of 220565 is 565022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-220565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220565.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557 + ... + 866.

It is an arithmetic number, because the mean of its divisors is an integer number (34176).

2²²⁰⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

220565 is a deficient number, since it is larger than the sum of its proper divisors (52843).

220565 is a wasteful number, since it uses less digits than its factorization.

220565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 220565 is about 469.6434818030. The cubic root of 220565 is about 60.4197419494.

Adding to 220565 its reverse (565022), we get a palindrome (785587).

The spelling of 220565 in words is "two hundred twenty thousand, five hundred sixty-five".