21009940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{103}}^1$

素因数の和:197

約数の個数: 96

約数和(自身を含む): 53673984

約数和(自身を除く): 32664044

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 47, 62, 70, 94, 103, 124, 140, 155, 188, 206, 217, 235, 310, 329, 412, 434, 470, 515, 620, 658, 721, 868, 940, 1030, 1085, 1316, 1442, 1457, 1645, 2060, 2170, 2884, 2914, 3193, 3290, 3605, 4340, 4841, 5828, 6386, 6580, 7210, 7285, 9682, 10199, 12772, 14420, 14570, 15965, 19364, 20398, 22351, 24205, 29140, 31930, 33887, 40796, 44702, 48410, 50995, 63860, 67774, 89404, 96820, 101990, 111755, 135548, 150071, 169435, 203980, 223510, 300142, 338870, 447020, 600284, 677740, 750355, 1050497, 1500710, 2100994, 3001420, 4201988, 5252485, 10504970, 21009940]

約数ペア:

[(1, 21009940), (2, 10504970), (4, 5252485), (5, 4201988), (7, 3001420), (10, 2100994), (14, 1500710), (20, 1050497), (28, 750355), (31, 677740), (35, 600284), (47, 447020), (62, 338870), (70, 300142), (94, 223510), (103, 203980), (124, 169435), (140, 150071), (155, 135548), (188, 111755), (206, 101990), (217, 96820), (235, 89404), (310, 67774), (329, 63860), (412, 50995), (434, 48410), (470, 44702), (515, 40796), (620, 33887), (658, 31930), (721, 29140), (868, 24205), (940, 22351), (1030, 20398), (1085, 19364), (1316, 15965), (1442, 14570), (1457, 14420), (1645, 12772), (2060, 10199), (2170, 9682), (2884, 7285), (2914, 7210), (3193, 6580), (3290, 6386), (3605, 5828), (4340, 4841)]