20991249

素因数分解:

$3^2\times {\mathrm{23}}^2\times {\mathrm{4409}}^1$

素因数の和:4461

約数の個数: 18

約数和(自身を含む): 31703490

約数和(自身を除く): 10712241

約数列:

[1, 3, 9, 23, 69, 207, 529, 1587, 4409, 4761, 13227, 39681, 101407, 304221, 912663, 2332361, 6997083, 20991249]

約数ペア:

[(1, 20991249), (3, 6997083), (9, 2332361), (23, 912663), (69, 304221), (207, 101407), (529, 39681), (1587, 13227), (4409, 4761)]