20508740

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{263}}^1\times {\mathrm{557}}^1$

素因数の和:836

約数の個数: 48

約数和(自身を含む): 49496832

約数和(自身を除く): 28988092

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 263, 526, 557, 1052, 1114, 1315, 1841, 2228, 2630, 2785, 3682, 3899, 5260, 5570, 7364, 7798, 9205, 11140, 15596, 18410, 19495, 36820, 38990, 77980, 146491, 292982, 585964, 732455, 1025437, 1464910, 2050874, 2929820, 4101748, 5127185, 10254370, 20508740]

約数ペア:

[(1, 20508740), (2, 10254370), (4, 5127185), (5, 4101748), (7, 2929820), (10, 2050874), (14, 1464910), (20, 1025437), (28, 732455), (35, 585964), (70, 292982), (140, 146491), (263, 77980), (526, 38990), (557, 36820), (1052, 19495), (1114, 18410), (1315, 15596), (1841, 11140), (2228, 9205), (2630, 7798), (2785, 7364), (3682, 5570), (3899, 5260)]