205556 has 24 divisors (see below), whose sum is σ = 399840. Its totient is φ = 91872.

The previous prime is 205553. The next prime is 205559. The reversal of 205556 is 655502.

205556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (205553) and next prime (205559).

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 7 ways as a sum of consecutive naturals, for example, 3035 + ... + 3101.

It is an arithmetic number, because the mean of its divisors is an integer number (16660).

2²⁰⁵⁵⁵⁶ is an apocalyptic number.

205556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

205556 is a deficient number, since it is larger than the sum of its proper divisors (194284).

205556 is a wasteful number, since it uses less digits than its factorization.

205556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 205556 is about 453.3828404340. The cubic root of 205556 is about 59.0169442858.

The spelling of 205556 in words is "two hundred five thousand, five hundred fifty-six".