21708680

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1$

素因数の和:151

約数の個数: 128

約数和(自身を含む): 59996160

約数和(自身を除く): 38287480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 31, 35, 40, 41, 56, 61, 62, 70, 82, 122, 124, 140, 155, 164, 205, 217, 244, 248, 280, 287, 305, 310, 328, 410, 427, 434, 488, 574, 610, 620, 820, 854, 868, 1085, 1148, 1220, 1240, 1271, 1435, 1640, 1708, 1736, 1891, 2135, 2170, 2296, 2440, 2501, 2542, 2870, 3416, 3782, 4270, 4340, 5002, 5084, 5740, 6355, 7564, 8540, 8680, 8897, 9455, 10004, 10168, 11480, 12505, 12710, 13237, 15128, 17080, 17507, 17794, 18910, 20008, 25010, 25420, 26474, 35014, 35588, 37820, 44485, 50020, 50840, 52948, 66185, 70028, 71176, 75640, 77531, 87535, 88970, 100040, 105896, 132370, 140056, 155062, 175070, 177940, 264740, 310124, 350140, 355880, 387655, 529480, 542717, 620248, 700280, 775310, 1085434, 1550620, 2170868, 2713585, 3101240, 4341736, 5427170, 10854340, 21708680]

約数ペア:

[(1, 21708680), (2, 10854340), (4, 5427170), (5, 4341736), (7, 3101240), (8, 2713585), (10, 2170868), (14, 1550620), (20, 1085434), (28, 775310), (31, 700280), (35, 620248), (40, 542717), (41, 529480), (56, 387655), (61, 355880), (62, 350140), (70, 310124), (82, 264740), (122, 177940), (124, 175070), (140, 155062), (155, 140056), (164, 132370), (205, 105896), (217, 100040), (244, 88970), (248, 87535), (280, 77531), (287, 75640), (305, 71176), (310, 70028), (328, 66185), (410, 52948), (427, 50840), (434, 50020), (488, 44485), (574, 37820), (610, 35588), (620, 35014), (820, 26474), (854, 25420), (868, 25010), (1085, 20008), (1148, 18910), (1220, 17794), (1240, 17507), (1271, 17080), (1435, 15128), (1640, 13237), (1708, 12710), (1736, 12505), (1891, 11480), (2135, 10168), (2170, 10004), (2296, 9455), (2440, 8897), (2501, 8680), (2542, 8540), (2870, 7564), (3416, 6355), (3782, 5740), (4270, 5084), (4340, 5002)]