21445520

素因数分解:

$2^4\times 5^1\times {\mathrm{268069}}^1$

素因数の和:268082

約数の個数: 20

約数和(自身を含む): 49861020

約数和(自身を除く): 28415500

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268069, 536138, 1072276, 1340345, 2144552, 2680690, 4289104, 5361380, 10722760, 21445520]

約数ペア:

[(1, 21445520), (2, 10722760), (4, 5361380), (5, 4289104), (8, 2680690), (10, 2144552), (16, 1340345), (20, 1072276), (40, 536138), (80, 268069)]