21000980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{1049}}^1$

素因数の和:1089

約数の個数: 96

約数和(自身を含む): 59270400

約数和(自身を除く): 38269420

約数列:

[1, 2, 4, 5, 7, 10, 11, 13, 14, 20, 22, 26, 28, 35, 44, 52, 55, 65, 70, 77, 91, 110, 130, 140, 143, 154, 182, 220, 260, 286, 308, 364, 385, 455, 572, 715, 770, 910, 1001, 1049, 1430, 1540, 1820, 2002, 2098, 2860, 4004, 4196, 5005, 5245, 7343, 10010, 10490, 11539, 13637, 14686, 20020, 20980, 23078, 27274, 29372, 36715, 46156, 54548, 57695, 68185, 73430, 80773, 95459, 115390, 136370, 146860, 150007, 161546, 190918, 230780, 272740, 300014, 323092, 381836, 403865, 477295, 600028, 750035, 807730, 954590, 1050049, 1500070, 1615460, 1909180, 2100098, 3000140, 4200196, 5250245, 10500490, 21000980]

約数ペア:

[(1, 21000980), (2, 10500490), (4, 5250245), (5, 4200196), (7, 3000140), (10, 2100098), (11, 1909180), (13, 1615460), (14, 1500070), (20, 1050049), (22, 954590), (26, 807730), (28, 750035), (35, 600028), (44, 477295), (52, 403865), (55, 381836), (65, 323092), (70, 300014), (77, 272740), (91, 230780), (110, 190918), (130, 161546), (140, 150007), (143, 146860), (154, 136370), (182, 115390), (220, 95459), (260, 80773), (286, 73430), (308, 68185), (364, 57695), (385, 54548), (455, 46156), (572, 36715), (715, 29372), (770, 27274), (910, 23078), (1001, 20980), (1049, 20020), (1430, 14686), (1540, 13637), (1820, 11539), (2002, 10490), (2098, 10010), (2860, 7343), (4004, 5245), (4196, 5005)]