21087280

素因数分解:

$2^4\times 5^1\times {\mathrm{263591}}^1$

素因数の和:263604

約数の個数: 20

約数和(自身を含む): 49028112

約数和(自身を除く): 27940832

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263591, 527182, 1054364, 1317955, 2108728, 2635910, 4217456, 5271820, 10543640, 21087280]

約数ペア:

[(1, 21087280), (2, 10543640), (4, 5271820), (5, 4217456), (8, 2635910), (10, 2108728), (16, 1317955), (20, 1054364), (40, 527182), (80, 263591)]