21059428

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31153}}^1$

素因数の和:31183

約数の個数: 18

約数和(自身を含む): 39908274

約数和(自身を除く): 18848846

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31153, 62306, 124612, 404989, 809978, 1619956, 5264857, 10529714, 21059428]

約数ペア:

[(1, 21059428), (2, 10529714), (4, 5264857), (13, 1619956), (26, 809978), (52, 404989), (169, 124612), (338, 62306), (676, 31153)]