207 (number)

{{Infobox number

| number = 207

| divisor = 1, 3, 9, 23, 69, 207

}}

207 (two hundred [and] seven) is the natural number following 206 and preceding 208. It is an odd composite number with a prime factorization of $3^2\cdot 23$ .

In Mathematics

207 is a Wedderburn-Etherington number.{{Cite OEIS|A001190|name=Wedderburn-Etherington numbers}}

There are exactly 207 different matchstick graphs with eight edges.{{Cite OEIS|A066951|name=Number of nonisomorphic connected graphs that can be drawn in the plane using n unit-length edges}}{{cite arXiv

| last = Salvia | first = Raffaele

| year = 2013

| title = A catalog for matchstick graphs

| eprint = 1303.5965| class = math.CO

}}

207 is a deficient number, as 207's proper divisors (divisors not including the number itself) only add up to 105: $1+3+9+23+69=105<207$ .

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