21351120

素因数分解:

$2^4\times 3^1\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{179}}^1$

素因数の和:273

約数の個数: 160

約数和(自身を含む): 77137920

約数和(自身を除く): 55786800

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 35, 40, 42, 48, 56, 60, 70, 71, 80, 84, 105, 112, 120, 140, 142, 168, 179, 210, 213, 240, 280, 284, 336, 355, 358, 420, 426, 497, 537, 560, 568, 710, 716, 840, 852, 895, 994, 1065, 1074, 1136, 1253, 1420, 1432, 1491, 1680, 1704, 1790, 1988, 2130, 2148, 2485, 2506, 2685, 2840, 2864, 2982, 3408, 3580, 3759, 3976, 4260, 4296, 4970, 5012, 5370, 5680, 5964, 6265, 7160, 7455, 7518, 7952, 8520, 8592, 9940, 10024, 10740, 11928, 12530, 12709, 14320, 14910, 15036, 17040, 18795, 19880, 20048, 21480, 23856, 25060, 25418, 29820, 30072, 37590, 38127, 39760, 42960, 50120, 50836, 59640, 60144, 63545, 75180, 76254, 88963, 100240, 101672, 119280, 127090, 150360, 152508, 177926, 190635, 203344, 254180, 266889, 300720, 305016, 355852, 381270, 444815, 508360, 533778, 610032, 711704, 762540, 889630, 1016720, 1067556, 1334445, 1423408, 1525080, 1779260, 2135112, 2668890, 3050160, 3558520, 4270224, 5337780, 7117040, 10675560, 21351120]

約数ペア:

[(1, 21351120), (2, 10675560), (3, 7117040), (4, 5337780), (5, 4270224), (6, 3558520), (7, 3050160), (8, 2668890), (10, 2135112), (12, 1779260), (14, 1525080), (15, 1423408), (16, 1334445), (20, 1067556), (21, 1016720), (24, 889630), (28, 762540), (30, 711704), (35, 610032), (40, 533778), (42, 508360), (48, 444815), (56, 381270), (60, 355852), (70, 305016), (71, 300720), (80, 266889), (84, 254180), (105, 203344), (112, 190635), (120, 177926), (140, 152508), (142, 150360), (168, 127090), (179, 119280), (210, 101672), (213, 100240), (240, 88963), (280, 76254), (284, 75180), (336, 63545), (355, 60144), (358, 59640), (420, 50836), (426, 50120), (497, 42960), (537, 39760), (560, 38127), (568, 37590), (710, 30072), (716, 29820), (840, 25418), (852, 25060), (895, 23856), (994, 21480), (1065, 20048), (1074, 19880), (1136, 18795), (1253, 17040), (1420, 15036), (1432, 14910), (1491, 14320), (1680, 12709), (1704, 12530), (1790, 11928), (1988, 10740), (2130, 10024), (2148, 9940), (2485, 8592), (2506, 8520), (2685, 7952), (2840, 7518), (2864, 7455), (2982, 7160), (3408, 6265), (3580, 5964), (3759, 5680), (3976, 5370), (4260, 5012), (4296, 4970)]