19987155

素因数分解:

$3^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{2903}}^1$

素因数の和:2937

約数の個数: 40

約数和(自身を含む): 37949472

約数和(自身を除く): 17962317

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 255, 405, 459, 765, 1377, 2295, 2903, 6885, 8709, 14515, 26127, 43545, 49351, 78381, 130635, 148053, 235143, 246755, 391905, 444159, 740265, 1175715, 1332477, 2220795, 3997431, 6662385, 19987155]

約数ペア:

[(1, 19987155), (3, 6662385), (5, 3997431), (9, 2220795), (15, 1332477), (17, 1175715), (27, 740265), (45, 444159), (51, 391905), (81, 246755), (85, 235143), (135, 148053), (153, 130635), (255, 78381), (405, 49351), (459, 43545), (765, 26127), (1377, 14515), (2295, 8709), (2903, 6885)]