21278169

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{269}}^1$

素因数の和:350

約数の個数: 48

約数和(自身を含む): 36391680

約数和(自身を除く): 15113511

約数列:

[1, 3, 9, 11, 17, 33, 47, 51, 99, 141, 153, 187, 269, 423, 517, 561, 799, 807, 1551, 1683, 2397, 2421, 2959, 4573, 4653, 7191, 8789, 8877, 12643, 13719, 26367, 26631, 37929, 41157, 50303, 79101, 113787, 139073, 150909, 214931, 417219, 452727, 644793, 1251657, 1934379, 2364241, 7092723, 21278169]

約数ペア:

[(1, 21278169), (3, 7092723), (9, 2364241), (11, 1934379), (17, 1251657), (33, 644793), (47, 452727), (51, 417219), (99, 214931), (141, 150909), (153, 139073), (187, 113787), (269, 79101), (423, 50303), (517, 41157), (561, 37929), (799, 26631), (807, 26367), (1551, 13719), (1683, 12643), (2397, 8877), (2421, 8789), (2959, 7191), (4573, 4653)]