21016945

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{197}}^1\times {\mathrm{1123}}^1$

素因数の和:1344

約数の個数: 16

約数和(自身を含む): 26706240

約数和(自身を除く): 5689295

約数列:

[1, 5, 19, 95, 197, 985, 1123, 3743, 5615, 18715, 21337, 106685, 221231, 1106155, 4203389, 21016945]

約数ペア:

[(1, 21016945), (5, 4203389), (19, 1106155), (95, 221231), (197, 106685), (985, 21337), (1123, 18715), (3743, 5615)]