Numeric Value: 18

The folowing table expresses '18' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.

BaseDR5DR4DR3DR2DR1
210010  101
3  200 2
4  102 3
5   33,112
6   303
7   246
8   224
9   202
10   189
11   178
12   167
13   156
14   145
15   134
16   123

Math World

Factors: 2 * 32

A 'Octadecagon' is a 'regular polygon' with 18 sides.

Physical World

18 is the atomic weight of Argon (Ar).