16978689

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{20731}}^1$

素因数の和:20757

約数の個数: 24

約数和(自身を含む): 30185792

約数和(自身を除く): 13207103

約数列:

[1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 273, 819, 20731, 62193, 145117, 186579, 269503, 435351, 808509, 1306053, 1886521, 2425527, 5659563, 16978689]

約数ペア:

[(1, 16978689), (3, 5659563), (7, 2425527), (9, 1886521), (13, 1306053), (21, 808509), (39, 435351), (63, 269503), (91, 186579), (117, 145117), (273, 62193), (819, 20731)]