20951905

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{283}}^1$

素因数の和:385

約数の個数: 32

約数和(自身を含む): 29199744

約数和(自身を除く): 8247839

約数列:

[1, 5, 13, 17, 65, 67, 85, 221, 283, 335, 871, 1105, 1139, 1415, 3679, 4355, 4811, 5695, 14807, 18395, 18961, 24055, 62543, 74035, 94805, 246493, 312715, 322337, 1232465, 1611685, 4190381, 20951905]

約数ペア:

[(1, 20951905), (5, 4190381), (13, 1611685), (17, 1232465), (65, 322337), (67, 312715), (85, 246493), (221, 94805), (283, 74035), (335, 62543), (871, 24055), (1105, 18961), (1139, 18395), (1415, 14807), (3679, 5695), (4355, 4811)]