21990928

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{80849}}^1$

素因数の和:80874

約数の個数: 20

約数和(自身を含む): 45114300

約数和(自身を除く): 23123372

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 80849, 161698, 323396, 646792, 1293584, 1374433, 2748866, 5497732, 10995464, 21990928]

約数ペア:

[(1, 21990928), (2, 10995464), (4, 5497732), (8, 2748866), (16, 1374433), (17, 1293584), (34, 646792), (68, 323396), (136, 161698), (272, 80849)]