20928215

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{2861}}^1$

素因数の和:2903

約数の個数: 32

約数和(自身を含む): 32970240

約数和(自身を除く): 12042025

約数列:

[1, 5, 7, 11, 19, 35, 55, 77, 95, 133, 209, 385, 665, 1045, 1463, 2861, 7315, 14305, 20027, 31471, 54359, 100135, 157355, 220297, 271795, 380513, 597949, 1101485, 1902565, 2989745, 4185643, 20928215]

約数ペア:

[(1, 20928215), (5, 4185643), (7, 2989745), (11, 1902565), (19, 1101485), (35, 597949), (55, 380513), (77, 271795), (95, 220297), (133, 157355), (209, 100135), (385, 54359), (665, 31471), (1045, 20027), (1463, 14305), (2861, 7315)]