21398860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{353}}^1\times {\mathrm{433}}^1$

素因数の和:802

約数の個数: 48

約数和(自身を含む): 51621696

約数和(自身を除く): 30222836

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 353, 433, 706, 866, 1412, 1732, 1765, 2165, 2471, 3031, 3530, 4330, 4942, 6062, 7060, 8660, 9884, 12124, 12355, 15155, 24710, 30310, 49420, 60620, 152849, 305698, 611396, 764245, 1069943, 1528490, 2139886, 3056980, 4279772, 5349715, 10699430, 21398860]

約数ペア:

[(1, 21398860), (2, 10699430), (4, 5349715), (5, 4279772), (7, 3056980), (10, 2139886), (14, 1528490), (20, 1069943), (28, 764245), (35, 611396), (70, 305698), (140, 152849), (353, 60620), (433, 49420), (706, 30310), (866, 24710), (1412, 15155), (1732, 12355), (1765, 12124), (2165, 9884), (2471, 8660), (3031, 7060), (3530, 6062), (4330, 4942)]