21007721

素因数分解:

$7^3\times {\mathrm{73}}^1\times {\mathrm{839}}^1$

素因数の和:933

約数の個数: 16

約数和(自身を含む): 24864000

約数和(自身を除く): 3856279

約数列:

[1, 7, 49, 73, 343, 511, 839, 3577, 5873, 25039, 41111, 61247, 287777, 428729, 3001103, 21007721]

約数ペア:

[(1, 21007721), (7, 3001103), (49, 428729), (73, 287777), (343, 61247), (511, 41111), (839, 25039), (3577, 5873)]