20768209

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{727}}^1$

素因数の和:805

約数の個数: 24

約数和(自身を含む): 26889408

約数和(自身を除く): 6121199

約数列:

[1, 7, 11, 49, 53, 77, 371, 539, 583, 727, 2597, 4081, 5089, 7997, 28567, 35623, 38531, 55979, 269717, 391853, 423841, 1888019, 2966887, 20768209]

約数ペア:

[(1, 20768209), (7, 2966887), (11, 1888019), (49, 423841), (53, 391853), (77, 269717), (371, 55979), (539, 38531), (583, 35623), (727, 28567), (2597, 7997), (4081, 5089)]