205885 has 4 divisors (see below), whose sum is σ = 247068. Its totient is φ = 164704.

The previous prime is 205883. The next prime is 205913. The reversal of 205885 is 588502.

205885 is nontrivially palindromic in base 7.

205885 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, and also an emirpimes, since its reverse is a distinct semiprime: 588502 = 2 ⋅294251.

It can be written as a sum of positive squares in 2 ways, for example, as 63001 + 142884 = 251^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 205885 - 2¹ = 205883 is a prime.

It is a Duffinian number.

205885 is an undulating number in base 7.

205885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205883) 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, 20584 + ... + 20593.

It is an arithmetic number, because the mean of its divisors is an integer number (61767).

2²⁰⁵⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

205885 is a deficient number, since it is larger than the sum of its proper divisors (41183).

205885 is an equidigital number, since it uses as much as digits as its factorization.

205885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41182.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 205885 is about 453.7455233939. The cubic root of 205885 is about 59.0484137717.

The spelling of 205885 in words is "two hundred five thousand, eight hundred eighty-five".