20509881

素因数分解:

$3^1\times 7^2\times {\mathrm{41}}^2\times {\mathrm{83}}^1$

素因数の和:182

約数の個数: 36

約数和(自身を含む): 32998896

約数和(自身を除く): 12489015

約数列:

[1, 3, 7, 21, 41, 49, 83, 123, 147, 249, 287, 581, 861, 1681, 1743, 2009, 3403, 4067, 5043, 6027, 10209, 11767, 12201, 23821, 35301, 71463, 82369, 139523, 166747, 247107, 418569, 500241, 976661, 2929983, 6836627, 20509881]

約数ペア:

[(1, 20509881), (3, 6836627), (7, 2929983), (21, 976661), (41, 500241), (49, 418569), (83, 247107), (123, 166747), (147, 139523), (249, 82369), (287, 71463), (581, 35301), (861, 23821), (1681, 12201), (1743, 11767), (2009, 10209), (3403, 6027), (4067, 5043)]