21990815

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{57119}}^1$

素因数の和:57142

約数の個数: 16

約数和(自身を含む): 32901120

約数和(自身を除く): 10910305

約数列:

[1, 5, 7, 11, 35, 55, 77, 385, 57119, 285595, 399833, 628309, 1999165, 3141545, 4398163, 21990815]

約数ペア:

[(1, 21990815), (5, 4398163), (7, 3141545), (11, 1999165), (35, 628309), (55, 399833), (77, 285595), (385, 57119)]