Some facts about the number 18 are that it is the only positive number that is equal to the sum of the digits multiplied by two, it is the atomic number of Argon and there are 18 holes on most golf courses. The number 18 is also the age at which United States citizens are legally allowed to vote.Continue Reading
While the first fact may sound confusing, broken down it is easy to understand. Twice the sum of its digits simply means if one adds the digits 1 and 8, the answer is nine. Nine multiplied by 2 is equal to the number 18.
There are many other interesting and obscure facts about this number: