20455540

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{20873}}^1$

素因数の和:20896

約数の個数: 36

約数和(自身を含む): 49972356

約数和(自身を除く): 29516816

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 20873, 41746, 83492, 104365, 146111, 208730, 292222, 417460, 584444, 730555, 1022777, 1461110, 2045554, 2922220, 4091108, 5113885, 10227770, 20455540]

約数ペア:

[(1, 20455540), (2, 10227770), (4, 5113885), (5, 4091108), (7, 2922220), (10, 2045554), (14, 1461110), (20, 1022777), (28, 730555), (35, 584444), (49, 417460), (70, 292222), (98, 208730), (140, 146111), (196, 104365), (245, 83492), (490, 41746), (980, 20873)]