21209320

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{59}}^1$

素因数の和:143

約数の個数: 128

約数和(自身を含む): 57024000

約数和(自身を除く): 35814680

約数列:

[1, 2, 4, 5, 8, 10, 11, 19, 20, 22, 38, 40, 43, 44, 55, 59, 76, 86, 88, 95, 110, 118, 152, 172, 190, 209, 215, 220, 236, 295, 344, 380, 418, 430, 440, 472, 473, 590, 649, 760, 817, 836, 860, 946, 1045, 1121, 1180, 1298, 1634, 1672, 1720, 1892, 2090, 2242, 2360, 2365, 2537, 2596, 3245, 3268, 3784, 4085, 4180, 4484, 4730, 5074, 5192, 5605, 6490, 6536, 8170, 8360, 8968, 8987, 9460, 10148, 11210, 12331, 12685, 12980, 16340, 17974, 18920, 20296, 22420, 24662, 25370, 25960, 27907, 32680, 35948, 44840, 44935, 48203, 49324, 50740, 55814, 61655, 71896, 89870, 96406, 98648, 101480, 111628, 123310, 139535, 179740, 192812, 223256, 241015, 246620, 279070, 359480, 385624, 482030, 493240, 530233, 558140, 964060, 1060466, 1116280, 1928120, 2120932, 2651165, 4241864, 5302330, 10604660, 21209320]

約数ペア:

[(1, 21209320), (2, 10604660), (4, 5302330), (5, 4241864), (8, 2651165), (10, 2120932), (11, 1928120), (19, 1116280), (20, 1060466), (22, 964060), (38, 558140), (40, 530233), (43, 493240), (44, 482030), (55, 385624), (59, 359480), (76, 279070), (86, 246620), (88, 241015), (95, 223256), (110, 192812), (118, 179740), (152, 139535), (172, 123310), (190, 111628), (209, 101480), (215, 98648), (220, 96406), (236, 89870), (295, 71896), (344, 61655), (380, 55814), (418, 50740), (430, 49324), (440, 48203), (472, 44935), (473, 44840), (590, 35948), (649, 32680), (760, 27907), (817, 25960), (836, 25370), (860, 24662), (946, 22420), (1045, 20296), (1121, 18920), (1180, 17974), (1298, 16340), (1634, 12980), (1672, 12685), (1720, 12331), (1892, 11210), (2090, 10148), (2242, 9460), (2360, 8987), (2365, 8968), (2537, 8360), (2596, 8170), (3245, 6536), (3268, 6490), (3784, 5605), (4085, 5192), (4180, 5074), (4484, 4730)]