21939281

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{12689}}^1$

素因数の和:12728

約数の個数: 16

約数和(自身を含む): 28425600

約数和(自身を除く): 6486319

約数列:

[1, 7, 13, 19, 91, 133, 247, 1729, 12689, 88823, 164957, 241091, 1154699, 1687637, 3134183, 21939281]

約数ペア:

[(1, 21939281), (7, 3134183), (13, 1687637), (19, 1154699), (91, 241091), (133, 164957), (247, 88823), (1729, 12689)]