21787689

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{257}}^1\times {\mathrm{367}}^1$

素因数の和:645

約数の個数: 32

約数和(自身を含む): 36458496

約数和(自身を除く): 14670807

約数列:

[1, 3, 7, 11, 21, 33, 77, 231, 257, 367, 771, 1101, 1799, 2569, 2827, 4037, 5397, 7707, 8481, 12111, 19789, 28259, 59367, 84777, 94319, 282957, 660233, 1037509, 1980699, 3112527, 7262563, 21787689]

約数ペア:

[(1, 21787689), (3, 7262563), (7, 3112527), (11, 1980699), (21, 1037509), (33, 660233), (77, 282957), (231, 94319), (257, 84777), (367, 59367), (771, 28259), (1101, 19789), (1799, 12111), (2569, 8481), (2827, 7707), (4037, 5397)]