639730040

素因数分解:

$2^3\times 5^1\times {\mathrm{15993251}}^1$

素因数の和:15993262

約数の個数: 16

約数和(自身を含む): 1439392680

約数和(自身を除く): 799662640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 15993251, 31986502, 63973004, 79966255, 127946008, 159932510, 319865020, 639730040]

約数ペア:

[(1, 639730040), (2, 319865020), (4, 159932510), (5, 127946008), (8, 79966255), (10, 63973004), (20, 31986502), (40, 15993251)]