20991280

素因数分解:

$2^4\times 5^1\times {\mathrm{262391}}^1$

素因数の和:262404

約数の個数: 20

約数和(自身を含む): 48804912

約数和(自身を除く): 27813632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262391, 524782, 1049564, 1311955, 2099128, 2623910, 4198256, 5247820, 10495640, 20991280]

約数ペア:

[(1, 20991280), (2, 10495640), (4, 5247820), (5, 4198256), (8, 2623910), (10, 2099128), (16, 1311955), (20, 1049564), (40, 524782), (80, 262391)]