# Divisors of the Positive Integer 18

1, 2, 3, 6, 9, 18## Sum of all the Divisors of 18, including itself

39## Sum of the Proper Divisors of 18

21## Properties of the number 18

The integer 18 is an**even**number.

The integer 18 is a

**Composite**number.

21 is

*greater than*18, so 18 is an

**abundant**number.

## The number 18 as a Roman Numeral

**XVIII**

## The number 18 in various Numeral Systems

Base |
Representation |
---|---|

2: | 10010 |

3: | 200 |

4: | 102 |

5: | 33 |

6: | 30 |

7: | 24 |

8: | 22 |

9: | 20 |

10: | 18 |

11: | 17 |

12: | 16 |

13: | 15 |

14: | 14 |

15: | 13 |

16: | 12 |

17: | 11 |

18: | 10 |

19: | I |

20: | I |

21: | I |

22: | I |

23: | I |

24: | I |

25: | I |

26: | I |

27: | I |

28: | I |

29: | I |

30: | I |

31: | I |

32: | I |

33: | I |

34: | I |

35: | I |

36: | I |