639241520

素因数分解:

$2^4\times 5^1\times {\mathrm{7990519}}^1$

素因数の和:7990532

約数の個数: 20

約数和(自身を含む): 1486236720

約数和(自身を除く): 846995200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 7990519, 15981038, 31962076, 39952595, 63924152, 79905190, 127848304, 159810380, 319620760, 639241520]

約数ペア:

[(1, 639241520), (2, 319620760), (4, 159810380), (5, 127848304), (8, 79905190), (10, 63924152), (16, 39952595), (20, 31962076), (40, 15981038), (80, 7990519)]