12720505

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{21379}}^1$

素因数の和:21408

約数の個数: 16

約数和(自身を含む): 18472320

約数和(自身を除く): 5751815

約数列:

[1, 5, 7, 17, 35, 85, 119, 595, 21379, 106895, 149653, 363443, 748265, 1817215, 2544101, 12720505]

約数ペア:

[(1, 12720505), (5, 2544101), (7, 1817215), (17, 748265), (35, 363443), (85, 149653), (119, 106895), (595, 21379)]