205855 has 8 divisors (see below), whose sum is σ = 266112. Its totient is φ = 151968.

The previous prime is 205847. The next prime is 205879. The reversal of 205855 is 558502.

205855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205855 - 2³ = 205847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1519 + ... + 1648.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2²⁰⁵⁸⁵⁵ is an apocalyptic number.

205855 is a deficient number, since it is larger than the sum of its proper divisors (60257).

205855 is a wasteful number, since it uses less digits than its factorization.

205855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 205855 is about 453.7124640122. The cubic root of 205855 is about 59.0455456034.

The spelling of 205855 in words is "two hundred five thousand, eight hundred fifty-five".