21207879

素因数分解:

$3^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{101}}^2$

素因数の和:229

約数の個数: 48

約数和(自身を含む): 39563520

約数和(自身を除く): 18355641

約数列:

[1, 3, 7, 9, 11, 21, 27, 33, 63, 77, 99, 101, 189, 231, 297, 303, 693, 707, 909, 1111, 2079, 2121, 2727, 3333, 6363, 7777, 9999, 10201, 19089, 23331, 29997, 30603, 69993, 71407, 91809, 112211, 209979, 214221, 275427, 336633, 642663, 785477, 1009899, 1927989, 2356431, 3029697, 7069293, 21207879]

約数ペア:

[(1, 21207879), (3, 7069293), (7, 3029697), (9, 2356431), (11, 1927989), (21, 1009899), (27, 785477), (33, 642663), (63, 336633), (77, 275427), (99, 214221), (101, 209979), (189, 112211), (231, 91809), (297, 71407), (303, 69993), (693, 30603), (707, 29997), (909, 23331), (1111, 19089), (2079, 10201), (2121, 9999), (2727, 7777), (3333, 6363)]