21983728

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{105691}}^1$

素因数の和:105712

約数の個数: 20

約数和(自身を含む): 45870328

約数和(自身を除く): 23886600

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 105691, 211382, 422764, 845528, 1373983, 1691056, 2747966, 5495932, 10991864, 21983728]

約数ペア:

[(1, 21983728), (2, 10991864), (4, 5495932), (8, 2747966), (13, 1691056), (16, 1373983), (26, 845528), (52, 422764), (104, 211382), (208, 105691)]