20716520

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{197}}^1\times {\mathrm{239}}^1$

素因数の和:458

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 30605080

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 197, 220, 239, 394, 440, 478, 788, 956, 985, 1195, 1576, 1912, 1970, 2167, 2390, 2629, 3940, 4334, 4780, 5258, 7880, 8668, 9560, 10516, 10835, 13145, 17336, 21032, 21670, 26290, 43340, 47083, 52580, 86680, 94166, 105160, 188332, 235415, 376664, 470830, 517913, 941660, 1035826, 1883320, 2071652, 2589565, 4143304, 5179130, 10358260, 20716520]

約数ペア:

[(1, 20716520), (2, 10358260), (4, 5179130), (5, 4143304), (8, 2589565), (10, 2071652), (11, 1883320), (20, 1035826), (22, 941660), (40, 517913), (44, 470830), (55, 376664), (88, 235415), (110, 188332), (197, 105160), (220, 94166), (239, 86680), (394, 52580), (440, 47083), (478, 43340), (788, 26290), (956, 21670), (985, 21032), (1195, 17336), (1576, 13145), (1912, 10835), (1970, 10516), (2167, 9560), (2390, 8668), (2629, 7880), (3940, 5258), (4334, 4780)]