20201980

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{571}}^1$

素因数の和:670

約数の個数: 48

約数和(自身を含む): 44684640

約数和(自身を除く): 24482660

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 61, 116, 122, 145, 244, 290, 305, 571, 580, 610, 1142, 1220, 1769, 2284, 2855, 3538, 5710, 7076, 8845, 11420, 16559, 17690, 33118, 34831, 35380, 66236, 69662, 82795, 139324, 165590, 174155, 331180, 348310, 696620, 1010099, 2020198, 4040396, 5050495, 10100990, 20201980]

約数ペア:

[(1, 20201980), (2, 10100990), (4, 5050495), (5, 4040396), (10, 2020198), (20, 1010099), (29, 696620), (58, 348310), (61, 331180), (116, 174155), (122, 165590), (145, 139324), (244, 82795), (290, 69662), (305, 66236), (571, 35380), (580, 34831), (610, 33118), (1142, 17690), (1220, 16559), (1769, 11420), (2284, 8845), (2855, 7076), (3538, 5710)]