27991719

素因数分解:

$3^2\times 7^1\times {\mathrm{643}}^1\times {\mathrm{691}}^1$

素因数の和:1347

約数の個数: 24

約数和(自身を含む): 46347392

約数和(自身を除く): 18355673

約数列:

[1, 3, 7, 9, 21, 63, 643, 691, 1929, 2073, 4501, 4837, 5787, 6219, 13503, 14511, 40509, 43533, 444313, 1332939, 3110191, 3998817, 9330573, 27991719]

約数ペア:

[(1, 27991719), (3, 9330573), (7, 3998817), (9, 3110191), (21, 1332939), (63, 444313), (643, 43533), (691, 40509), (1929, 14511), (2073, 13503), (4501, 6219), (4837, 5787)]