19910090

素因数分解:

$2^1\times 5^1\times {\mathrm{997}}^1\times {\mathrm{1997}}^1$

素因数の和:3001

約数の個数: 16

約数和(自身を含む): 35892072

約数和(自身を除く): 15981982

約数列:

[1, 2, 5, 10, 997, 1994, 1997, 3994, 4985, 9970, 9985, 19970, 1991009, 3982018, 9955045, 19910090]

約数ペア:

[(1, 19910090), (2, 9955045), (5, 3982018), (10, 1991009), (997, 19970), (1994, 9985), (1997, 9970), (3994, 4985)]