20003815

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{421}}^1$

素因数の和:499

約数の個数: 32

約数和(自身を含む): 28074816

約数和(自身を除く): 8071001

約数列:

[1, 5, 13, 17, 43, 65, 85, 215, 221, 421, 559, 731, 1105, 2105, 2795, 3655, 5473, 7157, 9503, 18103, 27365, 35785, 47515, 90515, 93041, 235339, 307751, 465205, 1176695, 1538755, 4000763, 20003815]

約数ペア:

[(1, 20003815), (5, 4000763), (13, 1538755), (17, 1176695), (43, 465205), (65, 307751), (85, 235339), (215, 93041), (221, 90515), (421, 47515), (559, 35785), (731, 27365), (1105, 18103), (2105, 9503), (2795, 7157), (3655, 5473)]