81605540

素因数分解:

$2^2\times 5^1\times {\mathrm{431}}^1\times {\mathrm{9467}}^1$

素因数の和:9907

約数の個数: 24

約数和(自身を含む): 171787392

約数和(自身を除く): 90181852

約数列:

[1, 2, 4, 5, 10, 20, 431, 862, 1724, 2155, 4310, 8620, 9467, 18934, 37868, 47335, 94670, 189340, 4080277, 8160554, 16321108, 20401385, 40802770, 81605540]

約数ペア:

[(1, 81605540), (2, 40802770), (4, 20401385), (5, 16321108), (10, 8160554), (20, 4080277), (431, 189340), (862, 94670), (1724, 47335), (2155, 37868), (4310, 18934), (8620, 9467)]