20641221

素因数分解:

$3^2\times {\mathrm{53}}^1\times {\mathrm{109}}^1\times {\mathrm{397}}^1$

素因数の和:565

約数の個数: 24

約数和(自身を含む): 30733560

約数和(自身を除く): 10092339

約数列:

[1, 3, 9, 53, 109, 159, 327, 397, 477, 981, 1191, 3573, 5777, 17331, 21041, 43273, 51993, 63123, 129819, 189369, 389457, 2293469, 6880407, 20641221]

約数ペア:

[(1, 20641221), (3, 6880407), (9, 2293469), (53, 389457), (109, 189369), (159, 129819), (327, 63123), (397, 51993), (477, 43273), (981, 21041), (1191, 17331), (3573, 5777)]