19980765

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{463}}^1$

素因数の和:618

約数の個数: 48

約数和(自身を含む): 39955968

約数和(自身を除く): 19975203

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 137, 315, 411, 463, 685, 959, 1233, 1389, 2055, 2315, 2877, 3241, 4167, 4795, 6165, 6945, 8631, 9723, 14385, 16205, 20835, 29169, 43155, 48615, 63431, 145845, 190293, 317155, 444017, 570879, 951465, 1332051, 2220085, 2854395, 3996153, 6660255, 19980765]

約数ペア:

[(1, 19980765), (3, 6660255), (5, 3996153), (7, 2854395), (9, 2220085), (15, 1332051), (21, 951465), (35, 570879), (45, 444017), (63, 317155), (105, 190293), (137, 145845), (315, 63431), (411, 48615), (463, 43155), (685, 29169), (959, 20835), (1233, 16205), (1389, 14385), (2055, 9723), (2315, 8631), (2877, 6945), (3241, 6165), (4167, 4795)]