19905215

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{349}}^1$

素因数の和:443

約数の個数: 32

約数和(自身を含む): 28123200

約数和(自身を除く): 8217985

約数列:

[1, 5, 11, 17, 55, 61, 85, 187, 305, 349, 671, 935, 1037, 1745, 3355, 3839, 5185, 5933, 11407, 19195, 21289, 29665, 57035, 65263, 106445, 234179, 326315, 361913, 1170895, 1809565, 3981043, 19905215]

約数ペア:

[(1, 19905215), (5, 3981043), (11, 1809565), (17, 1170895), (55, 361913), (61, 326315), (85, 234179), (187, 106445), (305, 65263), (349, 57035), (671, 29665), (935, 21289), (1037, 19195), (1745, 11407), (3355, 5933), (3839, 5185)]