How many divisor divides 420 as a whole no?

Answer 1

Extract pairs of factors as follows :-

1 x 420

2 x 210

3 x 140

4 x 105

5 x 84

6 x 70

7 x 60

10 x 42

12 x 35

14 x 30

15 x 28

20 x 21......after this pair, the factors are the same but in reverse order.

There are 24 different integers that divide wholly into 420.