19998517

素因数分解:

$7^2\times {\mathrm{11}}^2\times {\mathrm{3373}}^1$

素因数の和:3409

約数の個数: 18

約数和(自身を含む): 25578294

約数和(自身を除く): 5579777

約数列:

[1, 7, 11, 49, 77, 121, 539, 847, 3373, 5929, 23611, 37103, 165277, 259721, 408133, 1818047, 2856931, 19998517]

約数ペア:

[(1, 19998517), (7, 2856931), (11, 1818047), (49, 408133), (77, 259721), (121, 165277), (539, 37103), (847, 23611), (3373, 5929)]