206 has 4 divisors (see below), whose sum is σ = 312. Its totient is φ = 102.

The previous prime is 199. The next prime is 211. The reversal of 206 is 602.

Adding to 206 its reverse (602), we get a palindrome (808).

It can be divided in two parts, 20 and 6, that multiplied together give a triangular number (120 = T_{15}).

It is a semiprime because it is the product of two primes.

It is an Ulam number.

206 is a modest number, since divided by 6 gives 2 as remainder.

It is a plaindrome in base 9, base 11, base 13 and base 16.

It is a nialpdrome in base 6 and base 15.

It is a junction number, because it is equal to *n*+sod(*n*) for *n* = 193 and 202.

It is a congruent number.

It is an unprimeable number.

206 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50 + ... + 53.

It is an arithmetic number, because the mean of its divisors is an integer number (78).

206 is a deficient number, since it is larger than the sum of its proper divisors (106).

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

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

The sum of its prime factors is 105.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 206 is about 14.3527000944. The cubic root of 206 is about 5.9059405836.

The spelling of 206 in words is "two hundred six", and thus it is an aban number.

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