21488740

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{11807}}^1$

素因数の和:11836

約数の個数: 48

約数和(自身を含む): 55544832

約数和(自身を除く): 34056092

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820, 11807, 23614, 47228, 59035, 82649, 118070, 153491, 165298, 236140, 306982, 330596, 413245, 613964, 767455, 826490, 1074437, 1534910, 1652980, 2148874, 3069820, 4297748, 5372185, 10744370, 21488740]

約数ペア:

[(1, 21488740), (2, 10744370), (4, 5372185), (5, 4297748), (7, 3069820), (10, 2148874), (13, 1652980), (14, 1534910), (20, 1074437), (26, 826490), (28, 767455), (35, 613964), (52, 413245), (65, 330596), (70, 306982), (91, 236140), (130, 165298), (140, 153491), (182, 118070), (260, 82649), (364, 59035), (455, 47228), (910, 23614), (1820, 11807)]