220985 has 8 divisors (see below), whose sum is σ = 267720. Its totient is φ = 175104.

The previous prime is 220973. The next prime is 221021. The reversal of 220985 is 589022.

It can be written as a sum of positive squares in 4 ways, for example, as 41209 + 179776 = 203^2 + 424^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 220985 - 2¹⁴ = 204601 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851 + ... + 1079.

It is an arithmetic number, because the mean of its divisors is an integer number (33465).

2²²⁰⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

220985 is a deficient number, since it is larger than the sum of its proper divisors (46735).

220985 is a wasteful number, since it uses less digits than its factorization.

220985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 220985 is about 470.0904168349. The cubic root of 220985 is about 60.4580680686.

The spelling of 220985 in words is "two hundred twenty thousand, nine hundred eighty-five".