21457989

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{89}}^2$

素因数の和:234

約数の個数: 36

約数和(自身を含む): 36658336

約数和(自身を除く): 15200347

約数列:

[1, 3, 7, 9, 21, 43, 63, 89, 129, 267, 301, 387, 623, 801, 903, 1869, 2709, 3827, 5607, 7921, 11481, 23763, 26789, 34443, 55447, 71289, 80367, 166341, 241101, 340603, 499023, 1021809, 2384221, 3065427, 7152663, 21457989]

約数ペア:

[(1, 21457989), (3, 7152663), (7, 3065427), (9, 2384221), (21, 1021809), (43, 499023), (63, 340603), (89, 241101), (129, 166341), (267, 80367), (301, 71289), (387, 55447), (623, 34443), (801, 26789), (903, 23763), (1869, 11481), (2709, 7921), (3827, 5607)]