18720910

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:277

約数の個数: 64

約数和(自身を含む): 39517632

約数和(自身を除く): 20796722

約数列:

[1, 2, 5, 10, 13, 17, 26, 34, 43, 65, 85, 86, 130, 170, 197, 215, 221, 394, 430, 442, 559, 731, 985, 1105, 1118, 1462, 1970, 2210, 2561, 2795, 3349, 3655, 5122, 5590, 6698, 7310, 8471, 9503, 12805, 16745, 16942, 19006, 25610, 33490, 42355, 43537, 47515, 84710, 87074, 95030, 110123, 144007, 217685, 220246, 288014, 435370, 550615, 720035, 1101230, 1440070, 1872091, 3744182, 9360455, 18720910]

約数ペア:

[(1, 18720910), (2, 9360455), (5, 3744182), (10, 1872091), (13, 1440070), (17, 1101230), (26, 720035), (34, 550615), (43, 435370), (65, 288014), (85, 220246), (86, 217685), (130, 144007), (170, 110123), (197, 95030), (215, 87074), (221, 84710), (394, 47515), (430, 43537), (442, 42355), (559, 33490), (731, 25610), (985, 19006), (1105, 16942), (1118, 16745), (1462, 12805), (1970, 9503), (2210, 8471), (2561, 7310), (2795, 6698), (3349, 5590), (3655, 5122)]