20997165

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{311}}^1\times {\mathrm{643}}^1$

素因数の和:969

約数の個数: 32

約数和(自身を含む): 38578176

約数和(自身を除く): 17581011

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 311, 643, 933, 1555, 1929, 2177, 3215, 4501, 4665, 6531, 9645, 10885, 13503, 22505, 32655, 67515, 199973, 599919, 999865, 1399811, 2999595, 4199433, 6999055, 20997165]

約数ペア:

[(1, 20997165), (3, 6999055), (5, 4199433), (7, 2999595), (15, 1399811), (21, 999865), (35, 599919), (105, 199973), (311, 67515), (643, 32655), (933, 22505), (1555, 13503), (1929, 10885), (2177, 9645), (3215, 6531), (4501, 4665)]