206556 has 24 divisors (see below), whose sum is σ = 551040. Its totient is φ = 58992.

The previous prime is 206551. The next prime is 206593. The reversal of 206556 is 655602.

It is a super-2 number, since 2×206556² = 85330762272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206551) by changing a digit.

206556 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 7 ways as a sum of consecutive naturals, for example, 1146 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (22960).

2²⁰⁶⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

206556 is an abundant number, since it is smaller than the sum of its proper divisors (344484).

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

206556 is a wasteful number, since it uses less digits than its factorization.

206556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473 (or 2471 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 206556 is about 454.4843231620. The cubic root of 206556 is about 59.1124924563.

The spelling of 206556 in words is "two hundred six thousand, five hundred fifty-six".