21247149

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{103}}^1$

素因数の和:190

約数の個数: 64

約数和(自身を含む): 38338560

約数和(自身を除く): 17091411

約数列:

[1, 3, 7, 11, 19, 21, 33, 47, 57, 77, 103, 133, 141, 209, 231, 309, 329, 399, 517, 627, 721, 893, 987, 1133, 1463, 1551, 1957, 2163, 2679, 3399, 3619, 4389, 4841, 5871, 6251, 7931, 9823, 10857, 13699, 14523, 18753, 21527, 23793, 29469, 33887, 41097, 53251, 64581, 68761, 91979, 101661, 150689, 159753, 206283, 275937, 372757, 452067, 643853, 1011769, 1118271, 1931559, 3035307, 7082383, 21247149]

約数ペア:

[(1, 21247149), (3, 7082383), (7, 3035307), (11, 1931559), (19, 1118271), (21, 1011769), (33, 643853), (47, 452067), (57, 372757), (77, 275937), (103, 206283), (133, 159753), (141, 150689), (209, 101661), (231, 91979), (309, 68761), (329, 64581), (399, 53251), (517, 41097), (627, 33887), (721, 29469), (893, 23793), (987, 21527), (1133, 18753), (1463, 14523), (1551, 13699), (1957, 10857), (2163, 9823), (2679, 7931), (3399, 6251), (3619, 5871), (4389, 4841)]