199909989

素因数分解:

$3^2\times {\mathrm{73}}^1\times {\mathrm{137}}^1\times {\mathrm{2221}}^1$

素因数の和:2437

約数の個数: 24

約数和(自身を含む): 294983832

約数和(自身を除く): 95073843

約数列:

[1, 3, 9, 73, 137, 219, 411, 657, 1233, 2221, 6663, 10001, 19989, 30003, 90009, 162133, 304277, 486399, 912831, 1459197, 2738493, 22212221, 66636663, 199909989]

約数ペア:

[(1, 199909989), (3, 66636663), (9, 22212221), (73, 2738493), (137, 1459197), (219, 912831), (411, 486399), (657, 304277), (1233, 162133), (2221, 90009), (6663, 30003), (10001, 19989)]