1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440.
1, 31
1, 29
They are: 2 and 11
1, 2, 11 and 22
2, 5, 10, 25
1, 7, 13, 91.
1, 3, 11, 33.
1, 3, 7, and 21 are.
Its prime factors are 2 and 3
1, 2, 4, 8, 16.
440 + 440 + 440 + 440 + 440 + 440 = 2,640
1, 2, 4, 5, 10, and 20