19987317

素因数分解:

$3^4\times 7^1\times {\mathrm{35251}}^1$

素因数の和:35270

約数の個数: 20

約数和(自身を含む): 34123936

約数和(自身を除く): 14136619

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 567, 35251, 105753, 246757, 317259, 740271, 951777, 2220813, 2855331, 6662439, 19987317]

約数ペア:

[(1, 19987317), (3, 6662439), (7, 2855331), (9, 2220813), (21, 951777), (27, 740271), (63, 317259), (81, 246757), (189, 105753), (567, 35251)]