1, 2, 3, 6, 9, 18
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The number is 18, It is even number, it is factor of 198 and multiple of 9
The highest common factor of 21 and 18 is 3
18 6*3 = 18 54/18 = 3
Oh honey, 9 is indeed a factor of 18. You see, a factor is just a number that divides another number without leaving a remainder, and 9 fits that bill perfectly for 18. So go ahead and embrace the fact that 9 can cozy up to 18 without any drama.
18