206 is both a nontotient and a noncototient. 206 is an untouchable number. It is the lowest positive integer (when written in English) to employ all of the vowels once only. The other numbers sharing this property are 230, 250, 260, 602, 640, 5000, 8000, 9000, 80,000 and 90,000. 206 and 207 form the second pair of consecutive numbers (after 14 and 15) whose sums of divisors are equal. There are exactly 206 different linear forests on five labeled nodes, and exactly 206 regular semigroups of order four up to isomorphism and anti-isomorphism.

There are 206 bones in the typical adult human body.

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