20887280

素因数分解:

$2^4\times 5^1\times {\mathrm{157}}^1\times {\mathrm{1663}}^1$

素因数の和:1833

約数の個数: 40

約数和(自身を含む): 48901632

約数和(自身を除く): 28014352

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 157, 314, 628, 785, 1256, 1570, 1663, 2512, 3140, 3326, 6280, 6652, 8315, 12560, 13304, 16630, 26608, 33260, 66520, 133040, 261091, 522182, 1044364, 1305455, 2088728, 2610910, 4177456, 5221820, 10443640, 20887280]

約数ペア:

[(1, 20887280), (2, 10443640), (4, 5221820), (5, 4177456), (8, 2610910), (10, 2088728), (16, 1305455), (20, 1044364), (40, 522182), (80, 261091), (157, 133040), (314, 66520), (628, 33260), (785, 26608), (1256, 16630), (1570, 13304), (1663, 12560), (2512, 8315), (3140, 6652), (3326, 6280)]