206555 has 8 divisors (see below), whose sum is σ = 250800. Its totient is φ = 163296.

The previous prime is 206551. The next prime is 206593. The reversal of 206555 is 555602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206555 - 2² = 206551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206555.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356 + ... + 734.

It is an arithmetic number, because the mean of its divisors is an integer number (31350).

2²⁰⁶⁵⁵⁵ is an apocalyptic number.

206555 is a deficient number, since it is larger than the sum of its proper divisors (44245).

206555 is a wasteful number, since it uses less digits than its factorization.

206555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493.

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

The square root of 206555 is about 454.4832230127. The cubic root of 206555 is about 59.1123970623.

The spelling of 206555 in words is "two hundred six thousand, five hundred fifty-five".