20409869960

素因数分解:

$2^3\times 5^1\times {\mathrm{1999}}^1\times {\mathrm{255251}}^1$

素因数の和:257261

約数の個数: 32

約数和(自身を含む): 45945360000

約数和(自身を除く): 25535490040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 1999, 3998, 7996, 9995, 15992, 19990, 39980, 79960, 255251, 510502, 1021004, 1276255, 2042008, 2552510, 5105020, 10210040, 510246749, 1020493498, 2040986996, 2551233745, 4081973992, 5102467490, 10204934980, 20409869960]

約数ペア:

[(1, 20409869960), (2, 10204934980), (4, 5102467490), (5, 4081973992), (8, 2551233745), (10, 2040986996), (20, 1020493498), (40, 510246749), (1999, 10210040), (3998, 5105020), (7996, 2552510), (9995, 2042008), (15992, 1276255), (19990, 1021004), (39980, 510502), (79960, 255251)]