204556 has 12 divisors (see below), whose sum is σ = 390600. Its totient is φ = 92960.

The previous prime is 204521. The next prime is 204557. The reversal of 204556 is 655402.

204556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×204556³ = 25677806553334848, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (204557) by changing a digit.

204556 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 3 ways as a sum of consecutive naturals, for example, 2281 + ... + 2368.

It is an arithmetic number, because the mean of its divisors is an integer number (32550).

2²⁰⁴⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

204556 is a deficient number, since it is larger than the sum of its proper divisors (186044).

204556 is a wasteful number, since it uses less digits than its factorization.

204556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664 (or 4662 counting only the distinct ones).

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

The square root of 204556 is about 452.2786751550. The cubic root of 204556 is about 58.9210857254.

Adding to 204556 its reverse (655402), we get a palindrome (859958).

The spelling of 204556 in words is "two hundred four thousand, five hundred fifty-six".