21007580

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{137}}^1$

素因数の和:215

約数の個数: 96

約数和(自身を含む): 52581312

約数和(自身を除く): 31573732

約数列:

[1, 2, 4, 5, 10, 11, 17, 20, 22, 34, 41, 44, 55, 68, 82, 85, 110, 137, 164, 170, 187, 205, 220, 274, 340, 374, 410, 451, 548, 685, 697, 748, 820, 902, 935, 1370, 1394, 1507, 1804, 1870, 2255, 2329, 2740, 2788, 3014, 3485, 3740, 4510, 4658, 5617, 6028, 6970, 7535, 7667, 9020, 9316, 11234, 11645, 13940, 15070, 15334, 22468, 23290, 25619, 28085, 30140, 30668, 38335, 46580, 51238, 56170, 61787, 76670, 95489, 102476, 112340, 123574, 128095, 153340, 190978, 247148, 256190, 308935, 381956, 477445, 512380, 617870, 954890, 1050379, 1235740, 1909780, 2100758, 4201516, 5251895, 10503790, 21007580]

約数ペア:

[(1, 21007580), (2, 10503790), (4, 5251895), (5, 4201516), (10, 2100758), (11, 1909780), (17, 1235740), (20, 1050379), (22, 954890), (34, 617870), (41, 512380), (44, 477445), (55, 381956), (68, 308935), (82, 256190), (85, 247148), (110, 190978), (137, 153340), (164, 128095), (170, 123574), (187, 112340), (205, 102476), (220, 95489), (274, 76670), (340, 61787), (374, 56170), (410, 51238), (451, 46580), (548, 38335), (685, 30668), (697, 30140), (748, 28085), (820, 25619), (902, 23290), (935, 22468), (1370, 15334), (1394, 15070), (1507, 13940), (1804, 11645), (1870, 11234), (2255, 9316), (2329, 9020), (2740, 7667), (2788, 7535), (3014, 6970), (3485, 6028), (3740, 5617), (4510, 4658)]