21686781

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{6971}}^1$

素因数の和:7052

約数の個数: 16

約数和(自身を含む): 31123008

約数和(自身を除く): 9436227

約数列:

[1, 3, 17, 51, 61, 183, 1037, 3111, 6971, 20913, 118507, 355521, 425231, 1275693, 7228927, 21686781]

約数ペア:

[(1, 21686781), (3, 7228927), (17, 1275693), (51, 425231), (61, 355521), (183, 118507), (1037, 20913), (3111, 6971)]