21891331

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{263}}^1$

素因数の和:351

約数の個数: 32

約数和(自身を含む): 29196288

約数和(自身を除く): 7304957

約数列:

[1, 7, 11, 23, 47, 77, 161, 253, 263, 329, 517, 1081, 1771, 1841, 2893, 3619, 6049, 7567, 11891, 12361, 20251, 42343, 66539, 83237, 86527, 135971, 284303, 465773, 951797, 1990121, 3127333, 21891331]

約数ペア:

[(1, 21891331), (7, 3127333), (11, 1990121), (23, 951797), (47, 465773), (77, 284303), (161, 135971), (253, 86527), (263, 83237), (329, 66539), (517, 42343), (1081, 20251), (1771, 12361), (1841, 11891), (2893, 7567), (3619, 6049)]