Write all the factors of 220 first: 1, 2, 4, 5, 10,1,20, 22, 44, 55, ll0, 220,

After deducting 220 itself, these factors add up to1+2+4+5+10+1+20+22+44+55+10 = 280.

Then decompose the factors of 284: 1, 2,4,71,142,284,

Subtract 284 itself and add up all the factors1+2+4+71+142 = 220.

Do you see it? Except themselves, the total factor of 220 is 284, and the total factor of 284 is 220.

There is a passage in the famous Fermat's Last Theorem: "Coordinate → (284,220): It means → You have me in you and I have you in me. ...........................................................................................................................

You might think, this is really a wonderful set of numbers. You have me and I have you, just like a pair of lovers.

This pair of numbers is the earliest affinity number found in mathematics, and the name of the person who found them is Pythagoras.