20420991

素因数分解:

$3^5\times {\mathrm{19}}^1\times {\mathrm{4423}}^1$

素因数の和:4457

約数の個数: 24

約数和(自身を含む): 32206720

約数和(自身を除く): 11785729

約数列:

[1, 3, 9, 19, 27, 57, 81, 171, 243, 513, 1539, 4423, 4617, 13269, 39807, 84037, 119421, 252111, 358263, 756333, 1074789, 2268999, 6806997, 20420991]

約数ペア:

[(1, 20420991), (3, 6806997), (9, 2268999), (19, 1074789), (27, 756333), (57, 358263), (81, 252111), (171, 119421), (243, 84037), (513, 39807), (1539, 13269), (4423, 4617)]