21321139

素因数分解:

$7^1\times {\mathrm{37}}^1\times {\mathrm{191}}^1\times {\mathrm{431}}^1$

素因数の和:666

約数の個数: 16

約数和(自身を含む): 25214976

約数和(自身を除く): 3893837

約数列:

[1, 7, 37, 191, 259, 431, 1337, 3017, 7067, 15947, 49469, 82321, 111629, 576247, 3045877, 21321139]

約数ペア:

[(1, 21321139), (7, 3045877), (37, 576247), (191, 111629), (259, 82321), (431, 49469), (1337, 15947), (3017, 7067)]