21189531

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{107}}^1\times {\mathrm{353}}^1$

素因数の和:491

約数の個数: 32

約数和(自身を含む): 33032448

約数和(自身を除く): 11842917

約数列:

[1, 3, 11, 17, 33, 51, 107, 187, 321, 353, 561, 1059, 1177, 1819, 3531, 3883, 5457, 6001, 11649, 18003, 20009, 37771, 60027, 66011, 113313, 198033, 415481, 642107, 1246443, 1926321, 7063177, 21189531]

約数ペア:

[(1, 21189531), (3, 7063177), (11, 1926321), (17, 1246443), (33, 642107), (51, 415481), (107, 198033), (187, 113313), (321, 66011), (353, 60027), (561, 37771), (1059, 20009), (1177, 18003), (1819, 11649), (3531, 6001), (3883, 5457)]