21990120

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:203

約数の個数: 128

約数和(自身を含む): 69984000

約数和(自身を除く): 47993880

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 29, 30, 40, 58, 60, 71, 87, 89, 116, 120, 142, 145, 174, 178, 213, 232, 267, 284, 290, 348, 355, 356, 426, 435, 445, 534, 568, 580, 696, 710, 712, 852, 870, 890, 1065, 1068, 1160, 1335, 1420, 1704, 1740, 1780, 2059, 2130, 2136, 2581, 2670, 2840, 3480, 3560, 4118, 4260, 5162, 5340, 6177, 6319, 7743, 8236, 8520, 10295, 10324, 10680, 12354, 12638, 12905, 15486, 16472, 18957, 20590, 20648, 24708, 25276, 25810, 30885, 30972, 31595, 37914, 38715, 41180, 49416, 50552, 51620, 61770, 61944, 63190, 75828, 77430, 82360, 94785, 103240, 123540, 126380, 151656, 154860, 183251, 189570, 247080, 252760, 309720, 366502, 379140, 549753, 733004, 758280, 916255, 1099506, 1466008, 1832510, 2199012, 2748765, 3665020, 4398024, 5497530, 7330040, 10995060, 21990120]

約数ペア:

[(1, 21990120), (2, 10995060), (3, 7330040), (4, 5497530), (5, 4398024), (6, 3665020), (8, 2748765), (10, 2199012), (12, 1832510), (15, 1466008), (20, 1099506), (24, 916255), (29, 758280), (30, 733004), (40, 549753), (58, 379140), (60, 366502), (71, 309720), (87, 252760), (89, 247080), (116, 189570), (120, 183251), (142, 154860), (145, 151656), (174, 126380), (178, 123540), (213, 103240), (232, 94785), (267, 82360), (284, 77430), (290, 75828), (348, 63190), (355, 61944), (356, 61770), (426, 51620), (435, 50552), (445, 49416), (534, 41180), (568, 38715), (580, 37914), (696, 31595), (710, 30972), (712, 30885), (852, 25810), (870, 25276), (890, 24708), (1065, 20648), (1068, 20590), (1160, 18957), (1335, 16472), (1420, 15486), (1704, 12905), (1740, 12638), (1780, 12354), (2059, 10680), (2130, 10324), (2136, 10295), (2581, 8520), (2670, 8236), (2840, 7743), (3480, 6319), (3560, 6177), (4118, 5340), (4260, 5162)]