21253771

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{1091}}^1$

素因数の和:1143

約数の個数: 24

約数和(自身を含む): 27885312

約数和(自身を除く): 6631541

約数列:

[1, 7, 11, 23, 77, 121, 161, 253, 847, 1091, 1771, 2783, 7637, 12001, 19481, 25093, 84007, 132011, 175651, 276023, 924077, 1932161, 3036253, 21253771]

約数ペア:

[(1, 21253771), (7, 3036253), (11, 1932161), (23, 924077), (77, 276023), (121, 175651), (161, 132011), (253, 84007), (847, 25093), (1091, 19481), (1771, 12001), (2783, 7637)]