21151977

素因数分解:

$3^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{103}}^1\times {\mathrm{127}}^1$

素因数の和:258

約数の個数: 48

約数和(自身を含む): 36421632

約数和(自身を除く): 15269655

約数列:

[1, 3, 7, 11, 21, 33, 49, 77, 103, 127, 147, 231, 309, 381, 539, 721, 889, 1133, 1397, 1617, 2163, 2667, 3399, 4191, 5047, 6223, 7931, 9779, 13081, 15141, 18669, 23793, 29337, 39243, 55517, 68453, 91567, 143891, 166551, 205359, 274701, 431673, 640969, 1007237, 1922907, 3021711, 7050659, 21151977]

約数ペア:

[(1, 21151977), (3, 7050659), (7, 3021711), (11, 1922907), (21, 1007237), (33, 640969), (49, 431673), (77, 274701), (103, 205359), (127, 166551), (147, 143891), (231, 91567), (309, 68453), (381, 55517), (539, 39243), (721, 29337), (889, 23793), (1133, 18669), (1397, 15141), (1617, 13081), (2163, 9779), (2667, 7931), (3399, 6223), (4191, 5047)]