205870 has 32 divisors (see below), whose sum is σ = 451008. Its totient is φ = 66048.

The previous prime is 205847. The next prime is 205879. The reversal of 205870 is 78502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205879) by changing a digit.

205870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1104 + ... + 1276.

It is an arithmetic number, because the mean of its divisors is an integer number (14094).

2²⁰⁵⁸⁷⁰ is an apocalyptic number.

205870 is an abundant number, since it is smaller than the sum of its proper divisors (245138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205870 is a wasteful number, since it uses less digits than its factorization.

205870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 205870 is about 453.7289940041. The cubic root of 205870 is about 59.0469797224.

The spelling of 205870 in words is "two hundred five thousand, eight hundred seventy".