20807956

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{30781}}^1$

素因数の和:30811

約数の個数: 18

約数和(自身を含む): 39431742

約数和(自身を除く): 18623786

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 30781, 61562, 123124, 400153, 800306, 1600612, 5201989, 10403978, 20807956]

約数ペア:

[(1, 20807956), (2, 10403978), (4, 5201989), (13, 1600612), (26, 800306), (52, 400153), (169, 123124), (338, 61562), (676, 30781)]