20288905

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:146

約数の個数: 64

約数和(自身を含む): 32997888

約数和(自身を除く): 12708983

約数列:

[1, 5, 7, 13, 17, 35, 43, 61, 65, 85, 91, 119, 215, 221, 301, 305, 427, 455, 559, 595, 731, 793, 1037, 1105, 1505, 1547, 2135, 2623, 2795, 3655, 3913, 3965, 5117, 5185, 5551, 7259, 7735, 9503, 13115, 13481, 18361, 19565, 25585, 27755, 34099, 36295, 44591, 47515, 66521, 67405, 91805, 94367, 170495, 222955, 238693, 312137, 332605, 471835, 579683, 1193465, 1560685, 2898415, 4057781, 20288905]

約数ペア:

[(1, 20288905), (5, 4057781), (7, 2898415), (13, 1560685), (17, 1193465), (35, 579683), (43, 471835), (61, 332605), (65, 312137), (85, 238693), (91, 222955), (119, 170495), (215, 94367), (221, 91805), (301, 67405), (305, 66521), (427, 47515), (455, 44591), (559, 36295), (595, 34099), (731, 27755), (793, 25585), (1037, 19565), (1105, 18361), (1505, 13481), (1547, 13115), (2135, 9503), (2623, 7735), (2795, 7259), (3655, 5551), (3913, 5185), (3965, 5117)]