21609284

素因数分解:

$2^2\times {\mathrm{47}}^1\times {\mathrm{137}}^1\times {\mathrm{839}}^1$

素因数の和:1027

約数の個数: 24

約数和(自身を含む): 38949120

約数和(自身を除く): 17339836

約数列:

[1, 2, 4, 47, 94, 137, 188, 274, 548, 839, 1678, 3356, 6439, 12878, 25756, 39433, 78866, 114943, 157732, 229886, 459772, 5402321, 10804642, 21609284]

約数ペア:

[(1, 21609284), (2, 10804642), (4, 5402321), (47, 459772), (94, 229886), (137, 157732), (188, 114943), (274, 78866), (548, 39433), (839, 25756), (1678, 12878), (3356, 6439)]