Question 889795
Let's look at products of 6.
6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90
Which pairs equal 90?
6 + 84
12 + 78
18 + 72
66 + 24
60 + 30
54 + 36
48 + 42
Zero is a NEUTRAL integer.  I'm only seeing 7 pairs.  Ah, but this is a trick question -- there are actually 14.  Do you know why?
.
Reverse the numbers for the ordered pair.  Not just {6,84} but also {84,6}, etc.