21487131

素因数分解:

$3^2\times {\mathrm{47}}^1\times {\mathrm{79}}^1\times {\mathrm{643}}^1$

素因数の和:775

約数の個数: 24

約数和(自身を含む): 32148480

約数和(自身を除く): 10661349

約数列:

[1, 3, 9, 47, 79, 141, 237, 423, 643, 711, 1929, 3713, 5787, 11139, 30221, 33417, 50797, 90663, 152391, 271989, 457173, 2387459, 7162377, 21487131]

約数ペア:

[(1, 21487131), (3, 7162377), (9, 2387459), (47, 457173), (79, 271989), (141, 152391), (237, 90663), (423, 50797), (643, 33417), (711, 30221), (1929, 11139), (3713, 5787)]