20989213

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{131}}^1\times {\mathrm{487}}^1$

素因数の和:672

約数の個数: 16

約数和(自身を含む): 24735744

約数和(自身を除く): 3746531

約数列:

[1, 7, 47, 131, 329, 487, 917, 3409, 6157, 22889, 43099, 63797, 160223, 446579, 2998459, 20989213]

約数ペア:

[(1, 20989213), (7, 2998459), (47, 446579), (131, 160223), (329, 63797), (487, 43099), (917, 22889), (3409, 6157)]