20991705

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{199921}}^1$

素因数の和:199936

約数の個数: 16

約数和(自身を含む): 38385024

約数和(自身を除く): 17393319

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 199921, 599763, 999605, 1399447, 2998815, 4198341, 6997235, 20991705]

約数ペア:

[(1, 20991705), (3, 6997235), (5, 4198341), (7, 2998815), (15, 1399447), (21, 999605), (35, 599763), (105, 199921)]