21508420

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{113}}^1\times {\mathrm{307}}^1$

素因数の和:460

約数の個数: 48

約数和(自身を含む): 47190528

約数和(自身を除く): 25682108

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 113, 124, 155, 226, 307, 310, 452, 565, 614, 620, 1130, 1228, 1535, 2260, 3070, 3503, 6140, 7006, 9517, 14012, 17515, 19034, 34691, 35030, 38068, 47585, 69382, 70060, 95170, 138764, 173455, 190340, 346910, 693820, 1075421, 2150842, 4301684, 5377105, 10754210, 21508420]

約数ペア:

[(1, 21508420), (2, 10754210), (4, 5377105), (5, 4301684), (10, 2150842), (20, 1075421), (31, 693820), (62, 346910), (113, 190340), (124, 173455), (155, 138764), (226, 95170), (307, 70060), (310, 69382), (452, 47585), (565, 38068), (614, 35030), (620, 34691), (1130, 19034), (1228, 17515), (1535, 14012), (2260, 9517), (3070, 7006), (3503, 6140)]