21247985

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20333}}^1$

素因数の和:20368

約数の個数: 16

約数和(自身を含む): 29280960

約数和(自身を除く): 8032975

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20333, 101665, 223663, 386327, 1118315, 1931635, 4249597, 21247985]

約数ペア:

[(1, 21247985), (5, 4249597), (11, 1931635), (19, 1118315), (55, 386327), (95, 223663), (209, 101665), (1045, 20333)]