21909076

素因数分解:

$2^2\times 7^2\times {\mathrm{111781}}^1$

素因数の和:111799

約数の個数: 18

約数和(自身を含む): 44601018

約数和(自身を除く): 22691942

約数列:

[1, 2, 4, 7, 14, 28, 49, 98, 196, 111781, 223562, 447124, 782467, 1564934, 3129868, 5477269, 10954538, 21909076]

約数ペア:

[(1, 21909076), (2, 10954538), (4, 5477269), (7, 3129868), (14, 1564934), (28, 782467), (49, 447124), (98, 223562), (196, 111781)]