20790575

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1$

素因数の和:164

約数の個数: 48

約数和(自身を含む): 30373056

約数和(自身を除く): 9582481

約数列:

[1, 5, 13, 17, 25, 53, 65, 71, 85, 221, 265, 325, 355, 425, 689, 901, 923, 1105, 1207, 1325, 1775, 3445, 3763, 4505, 4615, 5525, 6035, 11713, 15691, 17225, 18815, 22525, 23075, 30175, 48919, 58565, 63971, 78455, 94075, 244595, 292825, 319855, 392275, 831623, 1222975, 1599275, 4158115, 20790575]

約数ペア:

[(1, 20790575), (5, 4158115), (13, 1599275), (17, 1222975), (25, 831623), (53, 392275), (65, 319855), (71, 292825), (85, 244595), (221, 94075), (265, 78455), (325, 63971), (355, 58565), (425, 48919), (689, 30175), (901, 23075), (923, 22525), (1105, 18815), (1207, 17225), (1325, 15691), (1775, 11713), (3445, 6035), (3763, 5525), (4505, 4615)]