205285 has 4 divisors (see below), whose sum is σ = 246348. Its totient is φ = 164224.

The previous prime is 205267. The next prime is 205297. The reversal of 205285 is 582502.

205285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 43681 + 161604 = 209^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 205285 - 2⁵ = 205253 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 6.

It is a congruent 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, 20524 + ... + 20533.

It is an arithmetic number, because the mean of its divisors is an integer number (61587).

2²⁰⁵²⁸⁵ is an apocalyptic number.

It is an amenable number.

205285 is a deficient number, since it is larger than the sum of its proper divisors (41063).

205285 is an equidigital number, since it uses as much as digits as its factorization.

205285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41062.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 205285 is about 453.0838774443. The cubic root of 205285 is about 58.9909973815.

Adding to 205285 its reverse (582502), we get a palindrome (787787).

The spelling of 205285 in words is "two hundred five thousand, two hundred eighty-five".