20987880

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{163}}^1$

素因数の和:243

約数の個数: 128

約数和(自身を含む): 67305600

約数和(自身を除く): 46317720

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 29, 30, 37, 40, 58, 60, 74, 87, 111, 116, 120, 145, 148, 163, 174, 185, 222, 232, 290, 296, 326, 348, 370, 435, 444, 489, 555, 580, 652, 696, 740, 815, 870, 888, 978, 1073, 1110, 1160, 1304, 1480, 1630, 1740, 1956, 2146, 2220, 2445, 3219, 3260, 3480, 3912, 4292, 4440, 4727, 4890, 5365, 6031, 6438, 6520, 8584, 9454, 9780, 10730, 12062, 12876, 14181, 16095, 18093, 18908, 19560, 21460, 23635, 24124, 25752, 28362, 30155, 32190, 36186, 37816, 42920, 47270, 48248, 56724, 60310, 64380, 70905, 72372, 90465, 94540, 113448, 120620, 128760, 141810, 144744, 174899, 180930, 189080, 241240, 283620, 349798, 361860, 524697, 567240, 699596, 723720, 874495, 1049394, 1399192, 1748990, 2098788, 2623485, 3497980, 4197576, 5246970, 6995960, 10493940, 20987880]

約数ペア:

[(1, 20987880), (2, 10493940), (3, 6995960), (4, 5246970), (5, 4197576), (6, 3497980), (8, 2623485), (10, 2098788), (12, 1748990), (15, 1399192), (20, 1049394), (24, 874495), (29, 723720), (30, 699596), (37, 567240), (40, 524697), (58, 361860), (60, 349798), (74, 283620), (87, 241240), (111, 189080), (116, 180930), (120, 174899), (145, 144744), (148, 141810), (163, 128760), (174, 120620), (185, 113448), (222, 94540), (232, 90465), (290, 72372), (296, 70905), (326, 64380), (348, 60310), (370, 56724), (435, 48248), (444, 47270), (489, 42920), (555, 37816), (580, 36186), (652, 32190), (696, 30155), (740, 28362), (815, 25752), (870, 24124), (888, 23635), (978, 21460), (1073, 19560), (1110, 18908), (1160, 18093), (1304, 16095), (1480, 14181), (1630, 12876), (1740, 12062), (1956, 10730), (2146, 9780), (2220, 9454), (2445, 8584), (3219, 6520), (3260, 6438), (3480, 6031), (3912, 5365), (4292, 4890), (4440, 4727)]