20173880

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{317}}^1$

素因数の和:408

約数の個数: 64

約数和(自身を含む): 47852640

約数和(自身を除く): 27678760

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 43, 74, 86, 148, 172, 185, 215, 296, 317, 344, 370, 430, 634, 740, 860, 1268, 1480, 1585, 1591, 1720, 2536, 3170, 3182, 6340, 6364, 7955, 11729, 12680, 12728, 13631, 15910, 23458, 27262, 31820, 46916, 54524, 58645, 63640, 68155, 93832, 109048, 117290, 136310, 234580, 272620, 469160, 504347, 545240, 1008694, 2017388, 2521735, 4034776, 5043470, 10086940, 20173880]

約数ペア:

[(1, 20173880), (2, 10086940), (4, 5043470), (5, 4034776), (8, 2521735), (10, 2017388), (20, 1008694), (37, 545240), (40, 504347), (43, 469160), (74, 272620), (86, 234580), (148, 136310), (172, 117290), (185, 109048), (215, 93832), (296, 68155), (317, 63640), (344, 58645), (370, 54524), (430, 46916), (634, 31820), (740, 27262), (860, 23458), (1268, 15910), (1480, 13631), (1585, 12728), (1591, 12680), (1720, 11729), (2536, 7955), (3170, 6364), (3182, 6340)]