204685 has 16 divisors (see below), whose sum is σ = 274176. Its totient is φ = 145728.

The previous prime is 204679. The next prime is 204707. The reversal of 204685 is 586402.

204685 is nontrivially palindromic in base 14.

It is a cyclic number.

It is not a de Polignac number, because 204685 - 2⁷ = 204557 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3022 + ... + 3088.

It is an arithmetic number, because the mean of its divisors is an integer number (17136).

2²⁰⁴⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

204685 is a deficient number, since it is larger than the sum of its proper divisors (69491).

204685 is a wasteful number, since it uses less digits than its factorization.

204685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 204685 is about 452.4212638681. The cubic root of 204685 is about 58.9334690057.

The spelling of 204685 in words is "two hundred four thousand, six hundred eighty-five".