They are: 1 542 2 and 271
1x40, 2x20, 4x10, 5x8 are all the factor pairs of 40.
The factor pairs for 38 are (1, 19) and (2, 38).
The factor pairs of 26 are: 1 × 26 2 × 13
1 and 23 1, 2, 271, 542
The factor pairs of 20 are pairs of numbers that can be multiplied together to give 20. The factor pairs of 20 are (1, 20), (2, 10), and (4, 5). These pairs represent all the possible combinations of numbers that can be multiplied to equal 20.
The 542 is cannot be because it's need 2 or more numbers.
They are:165,155,333,515,11
1,81,3,27,9
They are:200,1100,250,440,525,820,10
612,1306,2204,3153,4102,668,951,1236,1734,18
53,1
108,154,236,327,418,612,9