21120517

素因数分解:

${\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{241}}^1\times {\mathrm{257}}^1$

素因数の和:540

約数の個数: 16

約数和(自身を含む): 23975424

約数和(自身を除く): 2854907

約数列:

[1, 11, 31, 241, 257, 341, 2651, 2827, 7471, 7967, 61937, 82181, 87637, 681307, 1920047, 21120517]

約数ペア:

[(1, 21120517), (11, 1920047), (31, 681307), (241, 87637), (257, 82181), (341, 61937), (2651, 7967), (2827, 7471)]