21238552

素因数分解:

$2^3\times {\mathrm{409}}^1\times {\mathrm{6491}}^1$

素因数の和:6906

約数の個数: 16

約数和(自身を含む): 39925800

約数和(自身を除く): 18687248

約数列:

[1, 2, 4, 8, 409, 818, 1636, 3272, 6491, 12982, 25964, 51928, 2654819, 5309638, 10619276, 21238552]

約数ペア:

[(1, 21238552), (2, 10619276), (4, 5309638), (8, 2654819), (409, 51928), (818, 25964), (1636, 12982), (3272, 6491)]