21129521

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{353}}^1\times {\mathrm{503}}^1$

素因数の和:880

約数の個数: 16

約数和(自身を含む): 25691904

約数和(自身を除く): 4562383

約数列:

[1, 7, 17, 119, 353, 503, 2471, 3521, 6001, 8551, 42007, 59857, 177559, 1242913, 3018503, 21129521]

約数ペア:

[(1, 21129521), (7, 3018503), (17, 1242913), (119, 177559), (353, 59857), (503, 42007), (2471, 8551), (3521, 6001)]