21081489

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{313}}^1$

素因数の和:497

約数の個数: 32

約数和(自身を含む): 33339264

約数和(自身を除く): 12257775

約数列:

[1, 3, 11, 13, 33, 39, 143, 157, 313, 429, 471, 939, 1727, 2041, 3443, 4069, 5181, 6123, 10329, 12207, 22451, 44759, 49141, 67353, 134277, 147423, 540551, 638833, 1621653, 1916499, 7027163, 21081489]

約数ペア:

[(1, 21081489), (3, 7027163), (11, 1916499), (13, 1621653), (33, 638833), (39, 540551), (143, 147423), (157, 134277), (313, 67353), (429, 49141), (471, 44759), (939, 22451), (1727, 12207), (2041, 10329), (3443, 6123), (4069, 5181)]