21742721

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{107}}^1$

素因数の和:174

約数の個数: 48

約数和(自身を含む): 31026240

約数和(自身を除く): 9283519

約数列:

[1, 7, 11, 13, 29, 49, 77, 91, 107, 143, 203, 319, 377, 539, 637, 749, 1001, 1177, 1391, 1421, 2233, 2639, 3103, 4147, 5243, 7007, 8239, 9737, 15301, 15631, 18473, 21721, 29029, 34133, 40339, 57673, 68159, 107107, 152047, 203203, 238931, 282373, 443729, 749749, 1672517, 1976611, 3106103, 21742721]

約数ペア:

[(1, 21742721), (7, 3106103), (11, 1976611), (13, 1672517), (29, 749749), (49, 443729), (77, 282373), (91, 238931), (107, 203203), (143, 152047), (203, 107107), (319, 68159), (377, 57673), (539, 40339), (637, 34133), (749, 29029), (1001, 21721), (1177, 18473), (1391, 15631), (1421, 15301), (2233, 9737), (2639, 8239), (3103, 7007), (4147, 5243)]