19917729

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{107}}^1$

素因数の和:206

約数の個数: 48

約数和(自身を含む): 32864832

約数和(自身を除く): 12947103

約数列:

[1, 3, 9, 13, 37, 39, 43, 107, 111, 117, 129, 321, 333, 387, 481, 559, 963, 1391, 1443, 1591, 1677, 3959, 4173, 4329, 4601, 4773, 5031, 11877, 12519, 13803, 14319, 20683, 35631, 41409, 51467, 59813, 62049, 154401, 170237, 179439, 186147, 463203, 510711, 538317, 1532133, 2213081, 6639243, 19917729]

約数ペア:

[(1, 19917729), (3, 6639243), (9, 2213081), (13, 1532133), (37, 538317), (39, 510711), (43, 463203), (107, 186147), (111, 179439), (117, 170237), (129, 154401), (321, 62049), (333, 59813), (387, 51467), (481, 41409), (559, 35631), (963, 20683), (1391, 14319), (1443, 13803), (1591, 12519), (1677, 11877), (3959, 5031), (4173, 4773), (4329, 4601)]