21671181

素因数分解:

$3^2\times 7^2\times {\mathrm{157}}^1\times {\mathrm{313}}^1$

素因数の和:490

約数の個数: 36

約数和(自身を含む): 36762492

約数和(自身を除く): 15091311

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 157, 313, 441, 471, 939, 1099, 1413, 2191, 2817, 3297, 6573, 7693, 9891, 15337, 19719, 23079, 46011, 49141, 69237, 138033, 147423, 343987, 442269, 1031961, 2407909, 3095883, 7223727, 21671181]

約数ペア:

[(1, 21671181), (3, 7223727), (7, 3095883), (9, 2407909), (21, 1031961), (49, 442269), (63, 343987), (147, 147423), (157, 138033), (313, 69237), (441, 49141), (471, 46011), (939, 23079), (1099, 19719), (1413, 15337), (2191, 9891), (2817, 7693), (3297, 6573)]