21789820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{1949}}^1$

素因数の和:2014

約数の個数: 48

約数和(自身を含む): 50450400

約数和(自身を除く): 28660580

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 43, 52, 65, 86, 130, 172, 215, 260, 430, 559, 860, 1118, 1949, 2236, 2795, 3898, 5590, 7796, 9745, 11180, 19490, 25337, 38980, 50674, 83807, 101348, 126685, 167614, 253370, 335228, 419035, 506740, 838070, 1089491, 1676140, 2178982, 4357964, 5447455, 10894910, 21789820]

約数ペア:

[(1, 21789820), (2, 10894910), (4, 5447455), (5, 4357964), (10, 2178982), (13, 1676140), (20, 1089491), (26, 838070), (43, 506740), (52, 419035), (65, 335228), (86, 253370), (130, 167614), (172, 126685), (215, 101348), (260, 83807), (430, 50674), (559, 38980), (860, 25337), (1118, 19490), (1949, 11180), (2236, 9745), (2795, 7796), (3898, 5590)]