21990661

素因数分解:

$7^2\times {\mathrm{11}}^2\times {\mathrm{3709}}^1$

素因数の和:3745

約数の個数: 18

約数和(自身を含む): 28125510

約数和(自身を除く): 6134849

約数列:

[1, 7, 11, 49, 77, 121, 539, 847, 3709, 5929, 25963, 40799, 181741, 285593, 448789, 1999151, 3141523, 21990661]

約数ペア:

[(1, 21990661), (7, 3141523), (11, 1999151), (49, 448789), (77, 285593), (121, 181741), (539, 40799), (847, 25963), (3709, 5929)]