19916980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{107}}^1\times {\mathrm{227}}^1$

素因数の和:384

約数の個数: 48

約数和(自身を含む): 43436736

約数和(自身を除く): 23519756

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 107, 164, 205, 214, 227, 410, 428, 454, 535, 820, 908, 1070, 1135, 2140, 2270, 4387, 4540, 8774, 9307, 17548, 18614, 21935, 24289, 37228, 43870, 46535, 48578, 87740, 93070, 97156, 121445, 186140, 242890, 485780, 995849, 1991698, 3983396, 4979245, 9958490, 19916980]

約数ペア:

[(1, 19916980), (2, 9958490), (4, 4979245), (5, 3983396), (10, 1991698), (20, 995849), (41, 485780), (82, 242890), (107, 186140), (164, 121445), (205, 97156), (214, 93070), (227, 87740), (410, 48578), (428, 46535), (454, 43870), (535, 37228), (820, 24289), (908, 21935), (1070, 18614), (1135, 17548), (2140, 9307), (2270, 8774), (4387, 4540)]