20981320

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^2\times {\mathrm{1453}}^1$

素因数の和:1502

約数の個数: 48

約数和(自身を含む): 49857660

約数和(自身を除く): 28876340

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 152, 190, 361, 380, 722, 760, 1444, 1453, 1805, 2888, 2906, 3610, 5812, 7220, 7265, 11624, 14440, 14530, 27607, 29060, 55214, 58120, 110428, 138035, 220856, 276070, 524533, 552140, 1049066, 1104280, 2098132, 2622665, 4196264, 5245330, 10490660, 20981320]

約数ペア:

[(1, 20981320), (2, 10490660), (4, 5245330), (5, 4196264), (8, 2622665), (10, 2098132), (19, 1104280), (20, 1049066), (38, 552140), (40, 524533), (76, 276070), (95, 220856), (152, 138035), (190, 110428), (361, 58120), (380, 55214), (722, 29060), (760, 27607), (1444, 14530), (1453, 14440), (1805, 11624), (2888, 7265), (2906, 7220), (3610, 5812)]