220865 has 8 divisors (see below), whose sum is σ = 267648. Its totient is φ = 174960.

The previous prime is 220861. The next prime is 220873. The reversal of 220865 is 568022.

It is a happy number.

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

It is not a de Polignac number, because 220865 - 2² = 220861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220865.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680 + ... + 950.

It is an arithmetic number, because the mean of its divisors is an integer number (33456).

2²²⁰⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

220865 is a deficient number, since it is larger than the sum of its proper divisors (46783).

220865 is a wasteful number, since it uses less digits than its factorization.

220865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439.

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

The square root of 220865 is about 469.9627644825. The cubic root of 220865 is about 60.4471227077.

Adding to 220865 its reverse (568022), we get a palindrome (788887).

The spelling of 220865 in words is "two hundred twenty thousand, eight hundred sixty-five".