20981349

素因数分解:

$3^6\times {\mathrm{17}}^1\times {\mathrm{1693}}^1$

素因数の和:1728

約数の個数: 28

約数和(自身を含む): 33327756

約数和(自身を除く): 12346407

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 243, 459, 729, 1377, 1693, 4131, 5079, 12393, 15237, 28781, 45711, 86343, 137133, 259029, 411399, 777087, 1234197, 2331261, 6993783, 20981349]

約数ペア:

[(1, 20981349), (3, 6993783), (9, 2331261), (17, 1234197), (27, 777087), (51, 411399), (81, 259029), (153, 137133), (243, 86343), (459, 45711), (729, 28781), (1377, 15237), (1693, 12393), (4131, 5079)]