20405525

素因数分解:

$5^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^3$

素因数の和:91

約数の個数: 48

約数和(自身を含む): 32319360

約数和(自身を除く): 11913835

約数列:

[1, 5, 7, 17, 19, 25, 35, 85, 95, 119, 133, 175, 323, 361, 425, 475, 595, 665, 1615, 1805, 2261, 2527, 2975, 3325, 6137, 6859, 8075, 9025, 11305, 12635, 30685, 34295, 42959, 48013, 56525, 63175, 116603, 153425, 171475, 214795, 240065, 583015, 816221, 1073975, 1200325, 2915075, 4081105, 20405525]

約数ペア:

[(1, 20405525), (5, 4081105), (7, 2915075), (17, 1200325), (19, 1073975), (25, 816221), (35, 583015), (85, 240065), (95, 214795), (119, 171475), (133, 153425), (175, 116603), (323, 63175), (361, 56525), (425, 48013), (475, 42959), (595, 34295), (665, 30685), (1615, 12635), (1805, 11305), (2261, 9025), (2527, 8075), (2975, 6859), (3325, 6137)]