217390705

素因数分解:

$5^1\times 7^2\times {\mathrm{389}}^1\times {\mathrm{2281}}^1$

素因数の和:2689

約数の個数: 24

約数和(自身を含む): 304373160

約数和(自身を除く): 86982455

約数列:

[1, 5, 7, 35, 49, 245, 389, 1945, 2281, 2723, 11405, 13615, 15967, 19061, 79835, 95305, 111769, 558845, 887309, 4436545, 6211163, 31055815, 43478141, 217390705]

約数ペア:

[(1, 217390705), (5, 43478141), (7, 31055815), (35, 6211163), (49, 4436545), (245, 887309), (389, 558845), (1945, 111769), (2281, 95305), (2723, 79835), (11405, 19061), (13615, 15967)]