128400321

素因数分解:

$3^1\times 7^1\times {\mathrm{107}}^1\times {\mathrm{57143}}^1$

素因数の和:57260

約数の個数: 16

約数和(自身を含む): 197489664

約数和(自身を除く): 69089343

約数列:

[1, 3, 7, 21, 107, 321, 749, 2247, 57143, 171429, 400001, 1200003, 6114301, 18342903, 42800107, 128400321]

約数ペア:

[(1, 128400321), (3, 42800107), (7, 18342903), (21, 6114301), (107, 1200003), (321, 400001), (749, 171429), (2247, 57143)]