20905225

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{4001}}^1$

素因数の和:4041

約数の個数: 24

約数和(自身を含む): 29774880

約数和(自身を除く): 8869655

約数列:

[1, 5, 11, 19, 25, 55, 95, 209, 275, 475, 1045, 4001, 5225, 20005, 44011, 76019, 100025, 220055, 380095, 836209, 1100275, 1900475, 4181045, 20905225]

約数ペア:

[(1, 20905225), (5, 4181045), (11, 1900475), (19, 1100275), (25, 836209), (55, 380095), (95, 220055), (209, 100025), (275, 76019), (475, 44011), (1045, 20005), (4001, 5225)]