20997579

素因数分解:

$3^1\times {\mathrm{47}}^1\times {\mathrm{137}}^1\times {\mathrm{1087}}^1$

素因数の和:1274

約数の個数: 16

約数和(自身を含む): 28827648

約数和(自身を除く): 7830069

約数列:

[1, 3, 47, 137, 141, 411, 1087, 3261, 6439, 19317, 51089, 148919, 153267, 446757, 6999193, 20997579]

約数ペア:

[(1, 20997579), (3, 6999193), (47, 446757), (137, 153267), (141, 148919), (411, 51089), (1087, 19317), (3261, 6439)]