21186380

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7621}}^1$

素因数の和:7769

約数の個数: 24

約数和(自身を含む): 44817360

約数和(自身を除く): 23630980

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7621, 15242, 30484, 38105, 76210, 152420, 1059319, 2118638, 4237276, 5296595, 10593190, 21186380]

約数ペア:

[(1, 21186380), (2, 10593190), (4, 5296595), (5, 4237276), (10, 2118638), (20, 1059319), (139, 152420), (278, 76210), (556, 38105), (695, 30484), (1390, 15242), (2780, 7621)]