205564 has 12 divisors (see below), whose sum is σ = 381024. Its totient is φ = 96704.

The previous prime is 205559. The next prime is 205589. The reversal of 205564 is 465502.

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, 1444 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (31752).

2²⁰⁵⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

205564 is a deficient number, since it is larger than the sum of its proper divisors (175460).

205564 is a wasteful number, since it uses less digits than its factorization.

205564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044 (or 3042 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 205564 is about 453.3916629141. The cubic root of 205564 is about 59.0177098995.

The spelling of 205564 in words is "two hundred five thousand, five hundred sixty-four".