9991000

素因数分解:

$2^3\times 5^3\times {\mathrm{97}}^1\times {\mathrm{103}}^1$

素因数の和:221

約数の個数: 64

約数和(自身を含む): 23849280

約数和(自身を除く): 13858280

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 97, 100, 103, 125, 194, 200, 206, 250, 388, 412, 485, 500, 515, 776, 824, 970, 1000, 1030, 1940, 2060, 2425, 2575, 3880, 4120, 4850, 5150, 9700, 9991, 10300, 12125, 12875, 19400, 19982, 20600, 24250, 25750, 39964, 48500, 49955, 51500, 79928, 97000, 99910, 103000, 199820, 249775, 399640, 499550, 999100, 1248875, 1998200, 2497750, 4995500, 9991000]

約数ペア:

[(1, 9991000), (2, 4995500), (4, 2497750), (5, 1998200), (8, 1248875), (10, 999100), (20, 499550), (25, 399640), (40, 249775), (50, 199820), (97, 103000), (100, 99910), (103, 97000), (125, 79928), (194, 51500), (200, 49955), (206, 48500), (250, 39964), (388, 25750), (412, 24250), (485, 20600), (500, 19982), (515, 19400), (776, 12875), (824, 12125), (970, 10300), (1000, 9991), (1030, 9700), (1940, 5150), (2060, 4850), (2425, 4120), (2575, 3880)]