19980080

素因数分解:

$2^4\times 5^1\times {\mathrm{137}}^1\times {\mathrm{1823}}^1$

素因数の和:1973

約数の個数: 40

約数和(自身を含む): 46818432

約数和(自身を除く): 26838352

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 137, 274, 548, 685, 1096, 1370, 1823, 2192, 2740, 3646, 5480, 7292, 9115, 10960, 14584, 18230, 29168, 36460, 72920, 145840, 249751, 499502, 999004, 1248755, 1998008, 2497510, 3996016, 4995020, 9990040, 19980080]

約数ペア:

[(1, 19980080), (2, 9990040), (4, 4995020), (5, 3996016), (8, 2497510), (10, 1998008), (16, 1248755), (20, 999004), (40, 499502), (80, 249751), (137, 145840), (274, 72920), (548, 36460), (685, 29168), (1096, 18230), (1370, 14584), (1823, 10960), (2192, 9115), (2740, 7292), (3646, 5480)]