Courtesy of Wikipedia... facts about Eighteen (18):
Courtesy of Wikipedia... facts about Eighteen (18):

Eighteen is a composite number, its proper divisors being 1, 2, 3, 6 and 9. Three of these divisors (3, 6 and 9) add up to 18, hence 18 is a semiperfect number. Eighteen is the first inverted square-prime of the form p.q2.
It is a heptagonal number, and as the sum of the first three pentagonal numbers, it is a pentagonal pyramidal number. It is also the sum of the totient function for the first seven integers.
Eighteen is the second abundant number with the aliquot sum of 21 (117% in abundance) in the aliquot sequence (18, 21, 11, 1, 0) thus being the first composite number in the 11-aliquot tree. Eighteen is the aliquot sum of only one number the square 289.
In base 10 it is a Harshad number.
18, aside from 0, is the only number that equals twice the sum of its decimal digits.

The atomic number of argon
The 18-electron rule is a rule of thumb in transition metal chemistry for characterising and predicting the stability of metal complexes
The number of years in the Saros cycle of eclipses of the sun and moon

18:00, a time on the 24-hour clock corresponding to 6:00 PM.
A 2005 movie directed by Richard Bell and starring Brendan Fletcher and Alan Cumming.
Bobby Labonte's car number in the NASCAR Winston Cup Series when he won the 2000 Championship. This is J. J. Yeley's car number until the end of the 2007 Nextel Cup Season. Kyle Busch took the car number in 2008.
A 2002 album by electronic artist Moby.
The number of holes in a stipulated round of golf
The number of chapters into which James Joyce's epic novel Ulysses is divided
Russ Wheeler's car number in the film Days of Thunder
A slang term used in association football for the Penalty Area
The number of wheels on the most common type of North American tractor-trailer truck, which are hence often called 18-wheelers
The number of the French department Cher and the Turkish province Bitlis
DVD-18 is double-sided, double-layered DVD format
Android 18, a fictional character in the metaseries Dragon Ball.
The Hindu epic Mahabharata has eighteen sections, involves eighteen armies and is about a war fought over eighteen days
In some countries the number 18 means blood (relative)
In Chinese folklore, the Shaolin temple had a group of 18 bronze Monks. Initiates could only be considered full graduates of Shaolin martial arts if they could defeat them in combat.
In 1990 Megadeth released Hanger 18 as a single for the Rust in Piece Album.
Eighteen Eighteen, a South African Rap artist.
"I'm Eighteen", Alice Cooper's first Top Ten hit single, from their 1971 album Love It to Death.
Eighteen is also a surname, recorded in East Anglia in the 18th century [3]

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@113313 0039d316-1c4b-4281-b951-d872f2087c98

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