21506219

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{31}}^2\times {\mathrm{139}}^1$

素因数の和:231

約数の個数: 24

約数和(自身を含む): 26691840

約数和(自身を除く): 5185621

約数列:

[1, 7, 23, 31, 139, 161, 217, 713, 961, 973, 3197, 4309, 4991, 6727, 22103, 22379, 30163, 99107, 133579, 154721, 693749, 935053, 3072317, 21506219]

約数ペア:

[(1, 21506219), (7, 3072317), (23, 935053), (31, 693749), (139, 154721), (161, 133579), (217, 99107), (713, 30163), (961, 22379), (973, 22103), (3197, 6727), (4309, 4991)]