639823120

素因数分解:

$2^4\times 5^1\times {\mathrm{7997789}}^1$

素因数の和:7997802

約数の個数: 20

約数和(自身を含む): 1487588940

約数和(自身を除く): 847765820

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7997789, 15995578, 31991156, 39988945, 63982312, 79977890, 127964624, 159955780, 319911560, 639823120]

約数ペア:

[(1, 639823120), (2, 319911560), (4, 159955780), (5, 127964624), (8, 79977890), (10, 63982312), (16, 39988945), (20, 31991156), (40, 15995578), (80, 7997789)]