21381479

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{373}}^1\times {\mathrm{431}}^1$

素因数の和:830

約数の個数: 16

約数和(自身を含む): 25850880

約数和(自身を除く): 4469401

約数列:

[1, 7, 19, 133, 373, 431, 2611, 3017, 7087, 8189, 49609, 57323, 160763, 1125341, 3054497, 21381479]

約数ペア:

[(1, 21381479), (7, 3054497), (19, 1125341), (133, 160763), (373, 57323), (431, 49609), (2611, 8189), (3017, 7087)]