20991509

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{179}}^1\times {\mathrm{1523}}^1$

素因数の和:1720

約数の個数: 16

約数和(自身を含む): 26334720

約数和(自身を除く): 5343211

約数列:

[1, 7, 11, 77, 179, 1253, 1523, 1969, 10661, 13783, 16753, 117271, 272617, 1908319, 2998787, 20991509]

約数ペア:

[(1, 20991509), (7, 2998787), (11, 1908319), (77, 272617), (179, 117271), (1253, 16753), (1523, 13783), (1969, 10661)]