19901005

素因数分解:

$5^1\times {\mathrm{37}}^1\times {\mathrm{97}}^1\times {\mathrm{1109}}^1$

素因数の和:1248

約数の個数: 16

約数和(自身を含む): 24801840

約数和(自身を除く): 4900835

約数列:

[1, 5, 37, 97, 185, 485, 1109, 3589, 5545, 17945, 41033, 107573, 205165, 537865, 3980201, 19901005]

約数ペア:

[(1, 19901005), (5, 3980201), (37, 537865), (97, 205165), (185, 107573), (485, 41033), (1109, 17945), (3589, 5545)]