21745405

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20809}}^1$

素因数の和:20844

約数の個数: 16

約数和(自身を含む): 29966400

約数和(自身を除く): 8220995

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20809, 104045, 228899, 395371, 1144495, 1976855, 4349081, 21745405]

約数ペア:

[(1, 21745405), (5, 4349081), (11, 1976855), (19, 1144495), (55, 395371), (95, 228899), (209, 104045), (1045, 20809)]