20985321

素因数分解:

$3^1\times 7^1\times {\mathrm{181}}^1\times {\mathrm{5521}}^1$

素因数の和:5712

約数の個数: 16

約数和(自身を含む): 32160128

約数和(自身を除く): 11174807

約数列:

[1, 3, 7, 21, 181, 543, 1267, 3801, 5521, 16563, 38647, 115941, 999301, 2997903, 6995107, 20985321]

約数ペア:

[(1, 20985321), (3, 6995107), (7, 2997903), (21, 999301), (181, 115941), (543, 38647), (1267, 16563), (3801, 5521)]