what is the divisibility rule of 12, 13, 14, 15, 16, 17, 18, 19, 20?

As, 12, 14, 16, 18, 20 are even numbers.

They all are divisible by 2.

15 = 3*5 

it can either be divisible by 3 or 5 

13 = 1* 13

it is only divisible by 1 and 13.

and 17 = 1*17

it is only divisible by 1 or 17 

Moreover follow the link for the divisibility test for the given numbers.

https://www.meritnation.com/ask-answer/question/how-can-v-check-a-number-whether-it-is-divisible-by-2-3-4/playing-with-numbers/2704781

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