18991435

素因数分解:

$5^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{877}}^1$

素因数の和:1014

約数の個数: 16

約数和(自身を含む): 23516352

約数和(自身を除く): 4524917

約数列:

[1, 5, 61, 71, 305, 355, 877, 4331, 4385, 21655, 53497, 62267, 267485, 311335, 3798287, 18991435]

約数ペア:

[(1, 18991435), (5, 3798287), (61, 311335), (71, 267485), (305, 62267), (355, 53497), (877, 21655), (4331, 4385)]