19989850

素因数分解:

$2^1\times 5^2\times {\mathrm{401}}^1\times {\mathrm{997}}^1$

素因数の和:1410

約数の個数: 24

約数和(自身を含む): 37311228

約数和(自身を除く): 17321378

約数列:

[1, 2, 5, 10, 25, 50, 401, 802, 997, 1994, 2005, 4010, 4985, 9970, 10025, 20050, 24925, 49850, 399797, 799594, 1998985, 3997970, 9994925, 19989850]

約数ペア:

[(1, 19989850), (2, 9994925), (5, 3997970), (10, 1998985), (25, 799594), (50, 399797), (401, 49850), (802, 24925), (997, 20050), (1994, 10025), (2005, 9970), (4010, 4985)]