20655

素因数分解:

$3^5\times 5^1\times {\mathrm{17}}^1$

素因数の和:37

約数の個数: 24

約数和(自身を含む): 39312

約数和(自身を除く): 18657

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 243, 255, 405, 459, 765, 1215, 1377, 2295, 4131, 6885, 20655]

約数ペア:

[(1, 20655), (3, 6885), (5, 4131), (9, 2295), (15, 1377), (17, 1215), (27, 765), (45, 459), (51, 405), (81, 255), (85, 243), (135, 153)]