20778815540

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{1039}}^1\times {\mathrm{20407}}^1$

素因数の和:21469

約数の個数: 72

約数和(自身を含む): 50811022080

約数和(自身を除く): 30032206540

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 1039, 2078, 4156, 5195, 7273, 10390, 14546, 20407, 20780, 29092, 36365, 40814, 50911, 72730, 81628, 101822, 102035, 142849, 145460, 203644, 204070, 254555, 285698, 408140, 509110, 571396, 714245, 999943, 1018220, 1428490, 1999886, 2856980, 3999772, 4999715, 9999430, 19998860, 21202873, 42405746, 84811492, 106014365, 148420111, 212028730, 296840222, 424057460, 593680444, 742100555, 1038940777, 1484201110, 2077881554, 2968402220, 4155763108, 5194703885, 10389407770, 20778815540]

約数ペア:

[(1, 20778815540), (2, 10389407770), (4, 5194703885), (5, 4155763108), (7, 2968402220), (10, 2077881554), (14, 1484201110), (20, 1038940777), (28, 742100555), (35, 593680444), (49, 424057460), (70, 296840222), (98, 212028730), (140, 148420111), (196, 106014365), (245, 84811492), (490, 42405746), (980, 21202873), (1039, 19998860), (2078, 9999430), (4156, 4999715), (5195, 3999772), (7273, 2856980), (10390, 1999886), (14546, 1428490), (20407, 1018220), (20780, 999943), (29092, 714245), (36365, 571396), (40814, 509110), (50911, 408140), (72730, 285698), (81628, 254555), (101822, 204070), (102035, 203644), (142849, 145460)]