21219140

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{113}}^1\times {\mathrm{229}}^1$

素因数の和:392

約数の個数: 48

約数和(自身を含む): 46252080

約数和(自身を除く): 25032940

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 113, 164, 205, 226, 229, 410, 452, 458, 565, 820, 916, 1130, 1145, 2260, 2290, 4580, 4633, 9266, 9389, 18532, 18778, 23165, 25877, 37556, 46330, 46945, 51754, 92660, 93890, 103508, 129385, 187780, 258770, 517540, 1060957, 2121914, 4243828, 5304785, 10609570, 21219140]

約数ペア:

[(1, 21219140), (2, 10609570), (4, 5304785), (5, 4243828), (10, 2121914), (20, 1060957), (41, 517540), (82, 258770), (113, 187780), (164, 129385), (205, 103508), (226, 93890), (229, 92660), (410, 51754), (452, 46945), (458, 46330), (565, 37556), (820, 25877), (916, 23165), (1130, 18778), (1145, 18532), (2260, 9389), (2290, 9266), (4580, 4633)]