21456560

素因数分解:

$2^4\times 5^1\times {\mathrm{268207}}^1$

素因数の和:268220

約数の個数: 20

約数和(自身を含む): 49886688

約数和(自身を除く): 28430128

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268207, 536414, 1072828, 1341035, 2145656, 2682070, 4291312, 5364140, 10728280, 21456560]

約数ペア:

[(1, 21456560), (2, 10728280), (4, 5364140), (5, 4291312), (8, 2682070), (10, 2145656), (16, 1341035), (20, 1072828), (40, 536414), (80, 268207)]