20028465

素因数分解:

$3^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{2909}}^1$

素因数の和:2943

約数の個数: 40

約数和(自身を含む): 38027880

約数和(自身を除く): 17999415

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 255, 405, 459, 765, 1377, 2295, 2909, 6885, 8727, 14545, 26181, 43635, 49453, 78543, 130905, 148359, 235629, 247265, 392715, 445077, 741795, 1178145, 1335231, 2225385, 4005693, 6676155, 20028465]

約数ペア:

[(1, 20028465), (3, 6676155), (5, 4005693), (9, 2225385), (15, 1335231), (17, 1178145), (27, 741795), (45, 445077), (51, 392715), (81, 247265), (85, 235629), (135, 148359), (153, 130905), (255, 78543), (405, 49453), (459, 43635), (765, 26181), (1377, 14545), (2295, 8727), (2909, 6885)]