220805 has 16 divisors (see below), whose sum is σ = 295680. Its totient is φ = 157248.

The previous prime is 220793. The next prime is 220807. The reversal of 220805 is 508022.

It is a happy number.

It is not a de Polignac number, because 220805 - 2⁴ = 220789 is a prime.

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 220805.

It is not an unprimeable number, because it can be changed into a prime (220807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2756 + ... + 2834.

It is an arithmetic number, because the mean of its divisors is an integer number (18480).

2²²⁰⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

220805 is a deficient number, since it is larger than the sum of its proper divisors (74875).

220805 is a wasteful number, since it uses less digits than its factorization.

220805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 220805 is about 469.8989253020. The cubic root of 220805 is about 60.4416485405.

Adding to 220805 its reverse (508022), we get a palindrome (728827).

The spelling of 220805 in words is "two hundred twenty thousand, eight hundred five".