19881617

素因数分解:

$7^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{2647}}^1$

素因数の和:2720

約数の個数: 16

約数和(自身を含む): 24149760

約数和(自身を除く): 4268143

約数列:

[1, 7, 29, 37, 203, 259, 1073, 2647, 7511, 18529, 76763, 97939, 537341, 685573, 2840231, 19881617]

約数ペア:

[(1, 19881617), (7, 2840231), (29, 685573), (37, 537341), (203, 97939), (259, 76763), (1073, 18529), (2647, 7511)]