21039945

素因数分解:

$3^1\times 5^1\times {\mathrm{107}}^1\times {\mathrm{13109}}^1$

素因数の和:13224

約数の個数: 16

約数和(自身を含む): 33981120

約数和(自身を除く): 12941175

約数列:

[1, 3, 5, 15, 107, 321, 535, 1605, 13109, 39327, 65545, 196635, 1402663, 4207989, 7013315, 21039945]

約数ペア:

[(1, 21039945), (3, 7013315), (5, 4207989), (15, 1402663), (107, 196635), (321, 65545), (535, 39327), (1605, 13109)]