205085 has 4 divisors (see below), whose sum is σ = 246108. Its totient is φ = 164064.

The previous prime is 205081. The next prime is 205097. The reversal of 205085 is 580502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116281 + 88804 = 341^2 + 298^2 .

It is a cyclic number.

It is not a de Polignac number, because 205085 - 2² = 205081 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205085.

It is not an unprimeable number, because it can be changed into a prime (205081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20504 + ... + 20513.

It is an arithmetic number, because the mean of its divisors is an integer number (61527).

2²⁰⁵⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

205085 is a deficient number, since it is larger than the sum of its proper divisors (41023).

205085 is an equidigital number, since it uses as much as digits as its factorization.

205085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41022.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 205085 is about 452.8631139760. The cubic root of 205085 is about 58.9718337261.

Adding to 205085 its reverse (580502), we get a palindrome (785587).

The spelling of 205085 in words is "two hundred five thousand, eighty-five".