18 (alƙalami)
 18 | |
|---|---|
positive integer (en)  , abundant number (en) , even number (en) , heptagonal number (en) , pentagonal pyramidal number (en) , composite number (en) da harshad number (en) | |
 | |
| Bayanai | |
| Mabiyi | 17 |
| Ta biyo baya | 19 |
| Prime factor (en) | biyu da uku |
18 (goma sha takwas ko sha takwas) alƙalami ne, tsakanin 17 da 19.