19807280

素因数分解:

$2^4\times 5^1\times {\mathrm{247591}}^1$

素因数の和:247604

約数の個数: 20

約数和(自身を含む): 46052112

約数和(自身を除く): 26244832

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247591, 495182, 990364, 1237955, 1980728, 2475910, 3961456, 4951820, 9903640, 19807280]

約数ペア:

[(1, 19807280), (2, 9903640), (4, 4951820), (5, 3961456), (8, 2475910), (10, 1980728), (16, 1237955), (20, 990364), (40, 495182), (80, 247591)]