20881640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^2\times {\mathrm{3089}}^1$

素因数の和:3126

約数の個数: 48

約数和(自身を含む): 50892300

約数和(自身を除く): 30010660

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 169, 260, 338, 520, 676, 845, 1352, 1690, 3089, 3380, 6178, 6760, 12356, 15445, 24712, 30890, 40157, 61780, 80314, 123560, 160628, 200785, 321256, 401570, 522041, 803140, 1044082, 1606280, 2088164, 2610205, 4176328, 5220410, 10440820, 20881640]

約数ペア:

[(1, 20881640), (2, 10440820), (4, 5220410), (5, 4176328), (8, 2610205), (10, 2088164), (13, 1606280), (20, 1044082), (26, 803140), (40, 522041), (52, 401570), (65, 321256), (104, 200785), (130, 160628), (169, 123560), (260, 80314), (338, 61780), (520, 40157), (676, 30890), (845, 24712), (1352, 15445), (1690, 12356), (3089, 6760), (3380, 6178)]