206656 has 14 divisors (see below), whose sum is σ = 410210. Its totient is φ = 103296.

The previous prime is 206651. The next prime is 206699. The reversal of 206656 is 656602.

It can be written as a sum of positive squares in only one way, i.e., 160000 + 46656 = 400^2 + 216^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 206656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206651) by changing a digit.

206656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1551 + ... + 1678.

2²⁰⁶⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

206656 is a deficient number, since it is larger than the sum of its proper divisors (203554).

206656 is an equidigital number, since it uses as much as digits as its factorization.

206656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241 (or 3231 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 206656 is about 454.5943246456. The cubic root of 206656 is about 59.1220302984.

The spelling of 206656 in words is "two hundred six thousand, six hundred fifty-six".