20990445

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{199909}}^1$

素因数の和:199924

約数の個数: 16

約数和(自身を含む): 38382720

約数和(自身を除く): 17392275

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 199909, 599727, 999545, 1399363, 2998635, 4198089, 6996815, 20990445]

約数ペア:

[(1, 20990445), (3, 6996815), (5, 4198089), (7, 2998635), (15, 1399363), (21, 999545), (35, 599727), (105, 199909)]