220685 has 16 divisors (see below), whose sum is σ = 293760. Its totient is φ = 158400.

The previous prime is 220681. The next prime is 220687. The reversal of 220685 is 586022.

It is a happy number.

It is not a de Polignac number, because 220685 - 2² = 220681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 220685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220681) 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, 2135 + ... + 2235.

It is an arithmetic number, because the mean of its divisors is an integer number (18360).

2²²⁰⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

220685 is a deficient number, since it is larger than the sum of its proper divisors (73075).

220685 is a wasteful number, since it uses less digits than its factorization.

220685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 220685 is about 469.7712209150. The cubic root of 220685 is about 60.4306972303.

The spelling of 220685 in words is "two hundred twenty thousand, six hundred eighty-five".