20991215

素因数分解:

$5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{20681}}^1$

素因数の和:20722

約数の個数: 16

約数和(自身を含む): 29782080

約数和(自身を除く): 8790865

約数列:

[1, 5, 7, 29, 35, 145, 203, 1015, 20681, 103405, 144767, 599749, 723835, 2998745, 4198243, 20991215]

約数ペア:

[(1, 20991215), (5, 4198243), (7, 2998745), (29, 723835), (35, 599749), (145, 144767), (203, 103405), (1015, 20681)]