19471280

素因数分解:

$2^4\times 5^1\times {\mathrm{243391}}^1$

素因数の和:243404

約数の個数: 20

約数和(自身を含む): 45270912

約数和(自身を除く): 25799632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 243391, 486782, 973564, 1216955, 1947128, 2433910, 3894256, 4867820, 9735640, 19471280]

約数ペア:

[(1, 19471280), (2, 9735640), (4, 4867820), (5, 3894256), (8, 2433910), (10, 1947128), (16, 1216955), (20, 973564), (40, 486782), (80, 243391)]