205804 has 12 divisors (see below), whose sum is σ = 375984. Its totient is φ = 98384.

The previous prime is 205783. The next prime is 205817. The reversal of 205804 is 408502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027 + ... + 1210.

It is an arithmetic number, because the mean of its divisors is an integer number (31332).

2²⁰⁵⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

205804 is a deficient number, since it is larger than the sum of its proper divisors (170180).

205804 is a wasteful number, since it uses less digits than its factorization.

205804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264 (or 2262 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 205804 is about 453.6562575343. The cubic root of 205804 is about 59.0406690778.

The spelling of 205804 in words is "two hundred five thousand, eight hundred four".