639681721

素因数分解:

$7^2\times {\mathrm{19}}^1\times {\mathrm{241}}^1\times {\mathrm{2851}}^1$

素因数の和:3125

約数の個数: 24

約数和(自身を含む): 786809760

約数和(自身を除く): 147128039

約数列:

[1, 7, 19, 49, 133, 241, 931, 1687, 2851, 4579, 11809, 19957, 32053, 54169, 139699, 224371, 379183, 687091, 2654281, 4809637, 13054729, 33667459, 91383103, 639681721]

約数ペア:

[(1, 639681721), (7, 91383103), (19, 33667459), (49, 13054729), (133, 4809637), (241, 2654281), (931, 687091), (1687, 379183), (2851, 224371), (4579, 139699), (11809, 54169), (19957, 32053)]