20∣2 10∣2 5 ∣5 1 5 i t ′ s a m u lt i pl e o f 20 , b u t i t ′ s n o t a m u lt i pl e o f 2
5 and 1 because multiples of 2:2,4,10 those are also factors of 20.Factors of 20: 1, 2, 4, 5, 10
The factor of 20 that is not a multiple of 2 is 5. We found this by identifying the factors of 20 and checking which ones are not multiples of 2. The only number that fits this criterion is 5.
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