204655 has 12 divisors (see below), whose sum is σ = 272376. Its totient is φ = 146400.

The previous prime is 204641. The next prime is 204667. The reversal of 204655 is 556402.

It is not a de Polignac number, because 204655 - 2⁵ = 204623 is a prime.

It is a Duffinian number.

204655 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3325 + ... + 3385.

It is an arithmetic number, because the mean of its divisors is an integer number (22698).

2²⁰⁴⁶⁵⁵ is an apocalyptic number.

204655 is a deficient number, since it is larger than the sum of its proper divisors (67721).

204655 is an equidigital number, since it uses as much as digits as its factorization.

204655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 204655 is about 452.3881077128. The cubic root of 204655 is about 58.9305896375.

The spelling of 204655 in words is "two hundred four thousand, six hundred fifty-five".