21218907

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{563}}^1\times {\mathrm{739}}^1$

素因数の和:1322

約数の個数: 16

約数和(自身を含む): 30049920

約数和(自身を除く): 8831013

約数列:

[1, 3, 17, 51, 563, 739, 1689, 2217, 9571, 12563, 28713, 37689, 416057, 1248171, 7072969, 21218907]

約数ペア:

[(1, 21218907), (3, 7072969), (17, 1248171), (51, 416057), (563, 37689), (739, 28713), (1689, 12563), (2217, 9571)]