20809870821

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{877}}^1\times {\mathrm{138763}}^1$

素因数の和:139665

約数の個数: 24

約数和(自身を含む): 31677045920

約数和(自身を除く): 10867175099

約数列:

[1, 3, 9, 19, 57, 171, 877, 2631, 7893, 16663, 49989, 138763, 149967, 416289, 1248867, 2636497, 7909491, 23728473, 121695151, 365085453, 1095256359, 2312207869, 6936623607, 20809870821]

約数ペア:

[(1, 20809870821), (3, 6936623607), (9, 2312207869), (19, 1095256359), (57, 365085453), (171, 121695151), (877, 23728473), (2631, 7909491), (7893, 2636497), (16663, 1248867), (49989, 416289), (138763, 149967)]