20189006875

素因数分解:

$5^4\times {\mathrm{409}}^1\times {\mathrm{78979}}^1$

素因数の和:79408

約数の個数: 20

約数和(自身を含む): 25290185800

約数和(自身を除く): 5101178925

約数列:

[1, 5, 25, 125, 409, 625, 2045, 10225, 51125, 78979, 255625, 394895, 1974475, 9872375, 32302411, 49361875, 161512055, 807560275, 4037801375, 20189006875]

約数ペア:

[(1, 20189006875), (5, 4037801375), (25, 807560275), (125, 161512055), (409, 49361875), (625, 32302411), (2045, 9872375), (10225, 1974475), (51125, 394895), (78979, 255625)]