19904521

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{4127}}^1$

素因数の和:4200

約数の個数: 16

約数和(自身を含む): 24966144

約数和(自身を除く): 5061623

約数列:

[1, 7, 13, 53, 91, 371, 689, 4127, 4823, 28889, 53651, 218731, 375557, 1531117, 2843503, 19904521]

約数ペア:

[(1, 19904521), (7, 2843503), (13, 1531117), (53, 375557), (91, 218731), (371, 53651), (689, 28889), (4127, 4823)]