21980439

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{257}}^1$

素因数の和:336

約数の個数: 48

約数和(自身を含む): 37189152

約数和(自身を除く): 15208713

約数列:

[1, 3, 9, 13, 17, 39, 43, 51, 117, 129, 153, 221, 257, 387, 559, 663, 731, 771, 1677, 1989, 2193, 2313, 3341, 4369, 5031, 6579, 9503, 10023, 11051, 13107, 28509, 30069, 33153, 39321, 56797, 85527, 99459, 143663, 170391, 187867, 430989, 511173, 563601, 1292967, 1690803, 2442271, 7326813, 21980439]

約数ペア:

[(1, 21980439), (3, 7326813), (9, 2442271), (13, 1690803), (17, 1292967), (39, 563601), (43, 511173), (51, 430989), (117, 187867), (129, 170391), (153, 143663), (221, 99459), (257, 85527), (387, 56797), (559, 39321), (663, 33153), (731, 30069), (771, 28509), (1677, 13107), (1989, 11051), (2193, 10023), (2313, 9503), (3341, 6579), (4369, 5031)]