21087207

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{127}}^1\times {\mathrm{971}}^1$

素因数の和:1123

約数の個数: 24

約数和(自身を含む): 32348160

約数和(自身を除く): 11260953

約数列:

[1, 3, 9, 19, 57, 127, 171, 381, 971, 1143, 2413, 2913, 7239, 8739, 18449, 21717, 55347, 123317, 166041, 369951, 1109853, 2343023, 7029069, 21087207]

約数ペア:

[(1, 21087207), (3, 7029069), (9, 2343023), (19, 1109853), (57, 369951), (127, 166041), (171, 123317), (381, 55347), (971, 21717), (1143, 18449), (2413, 8739), (2913, 7239)]