205550 has 12 divisors (see below), whose sum is σ = 382416. Its totient is φ = 82200.

The previous prime is 205549. The next prime is 205553. The reversal of 205550 is 55502.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2006 + ... + 2105.

It is an arithmetic number, because the mean of its divisors is an integer number (31868).

2²⁰⁵⁵⁵⁰ is an apocalyptic number.

205550 is a deficient number, since it is larger than the sum of its proper divisors (176866).

205550 is a wasteful number, since it uses less digits than its factorization.

205550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123 (or 4118 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 17.

The square root of 205550 is about 453.3762234613. The cubic root of 205550 is about 59.0163700626.

The spelling of 205550 in words is "two hundred five thousand, five hundred fifty".