21660261

素因数分解:

$3^1\times 7^1\times {\mathrm{17}}^2\times {\mathrm{43}}^1\times {\mathrm{83}}^1$

素因数の和:170

約数の個数: 48

約数和(自身を含む): 36309504

約数和(自身を除く): 14649243

約数列:

[1, 3, 7, 17, 21, 43, 51, 83, 119, 129, 249, 289, 301, 357, 581, 731, 867, 903, 1411, 1743, 2023, 2193, 3569, 4233, 5117, 6069, 9877, 10707, 12427, 15351, 23987, 24983, 29631, 37281, 60673, 71961, 74949, 86989, 167909, 182019, 260967, 424711, 503727, 1031441, 1274133, 3094323, 7220087, 21660261]

約数ペア:

[(1, 21660261), (3, 7220087), (7, 3094323), (17, 1274133), (21, 1031441), (43, 503727), (51, 424711), (83, 260967), (119, 182019), (129, 167909), (249, 86989), (289, 74949), (301, 71961), (357, 60673), (581, 37281), (731, 29631), (867, 24983), (903, 23987), (1411, 15351), (1743, 12427), (2023, 10707), (2193, 9877), (3569, 6069), (4233, 5117)]