when you look list the possible factors of some even numbers they look like this -

60 (1, 2, 3, 4, 5,6,10, 12, 15, 20, 30, 60)

ie. Sometimes 2 numbers next to each other (in bold) on the list multiplied equal the number.

414 (1, 2, 3, 6, 9,18,23, 46, 69, 138, 207, 414)

80 (1, 2, 4, 5,8,10, 16, 20, 40, 80)

My question is - If I have an even number that I know will fulfill this criteria. (ie. 2 certain numbersnext to each otheron its factor list multiplied will equal the original number) Is there a formula for finding out what these 2 numbers will be without having to figure out the whole factor list and manually going through it?