19802019940

素因数分解:

$2^2\times 5^1\times {\mathrm{990100997}}^1$

素因数の和:990101006

約数の個数: 12

約数和(自身を含む): 41584241916

約数和(自身を除く): 21782221976

約数列:

[1, 2, 4, 5, 10, 20, 990100997, 1980201994, 3960403988, 4950504985, 9901009970, 19802019940]

約数ペア:

[(1, 19802019940), (2, 9901009970), (4, 4950504985), (5, 3960403988), (10, 1980201994), (20, 990100997)]