21987635

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{241}}^1\times {\mathrm{257}}^1$

素因数の和:574

約数の個数: 16

約数和(自身を含む): 26972352

約数和(自身を除く): 4984717

約数列:

[1, 5, 71, 241, 257, 355, 1205, 1285, 17111, 18247, 61937, 85555, 91235, 309685, 4397527, 21987635]

約数ペア:

[(1, 21987635), (5, 4397527), (71, 309685), (241, 91235), (257, 85555), (355, 61937), (1205, 18247), (1285, 17111)]