21663772

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{73}}^1\times {\mathrm{439}}^1$

素因数の和:542

約数の個数: 36

約数和(自身を含む): 41709360

約数和(自身を除く): 20045588

約数列:

[1, 2, 4, 13, 26, 52, 73, 146, 169, 292, 338, 439, 676, 878, 949, 1756, 1898, 3796, 5707, 11414, 12337, 22828, 24674, 32047, 49348, 64094, 74191, 128188, 148382, 296764, 416611, 833222, 1666444, 5415943, 10831886, 21663772]

約数ペア:

[(1, 21663772), (2, 10831886), (4, 5415943), (13, 1666444), (26, 833222), (52, 416611), (73, 296764), (146, 148382), (169, 128188), (292, 74191), (338, 64094), (439, 49348), (676, 32047), (878, 24674), (949, 22828), (1756, 12337), (1898, 11414), (3796, 5707)]