I am so board
11 is prime, so only 11 and 1
Just 1 and 11.
its a factor with two pairs of the same number
These are the 16 factor pairs for the number 1,080:1080,1540,2360,3270,4216,5180,6135,8120,9108,1090,1272,1560,1854,2045,2440,2736,30
A square number has an odd number of factors, but a number with an odd number of factor pairs is nothing special.
Number of factor pairs = number of rectangles
The number 18.
12 and 18 have three factor pairs.
76 has 3 factor pairs: (1,76), (2,38), (4,19).
12 and 18 have three factor pairs.
One pair: it's a prime number.
The factor pairs of 16 are (16,1)(8,2)(4,4)