21709457

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{19}}^2\times {\mathrm{71}}^1$

素因数の和:138

約数の個数: 36

約数和(自身を含む): 29187648

約数和(自身を除く): 7478191

約数列:

[1, 7, 11, 19, 71, 77, 121, 133, 209, 361, 497, 781, 847, 1349, 1463, 2299, 2527, 3971, 5467, 8591, 9443, 14839, 16093, 25631, 27797, 43681, 60137, 103873, 163229, 179417, 281941, 305767, 1142603, 1973587, 3101351, 21709457]

約数ペア:

[(1, 21709457), (7, 3101351), (11, 1973587), (19, 1142603), (71, 305767), (77, 281941), (121, 179417), (133, 163229), (209, 103873), (361, 60137), (497, 43681), (781, 27797), (847, 25631), (1349, 16093), (1463, 14839), (2299, 9443), (2527, 8591), (3971, 5467)]