20378491

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1\times {\mathrm{313}}^1$

素因数の和:522

約数の個数: 16

約数和(自身を含む): 23874048

約数和(自身を除く): 3495557

約数列:

[1, 7, 71, 131, 313, 497, 917, 2191, 9301, 22223, 41003, 65107, 155561, 287021, 2911213, 20378491]

約数ペア:

[(1, 20378491), (7, 2911213), (71, 287021), (131, 155561), (313, 65107), (497, 41003), (917, 22223), (2191, 9301)]