21978

素因数分解:

$2^1\times 3^3\times {\mathrm{11}}^1\times {\mathrm{37}}^1$

素因数の和:59

約数の個数: 32

約数和(自身を含む): 54720

約数和(自身を除く): 32742

約数列:

[1, 2, 3, 6, 9, 11, 18, 22, 27, 33, 37, 54, 66, 74, 99, 111, 198, 222, 297, 333, 407, 594, 666, 814, 999, 1221, 1998, 2442, 3663, 7326, 10989, 21978]

約数ペア:

[(1, 21978), (2, 10989), (3, 7326), (6, 3663), (9, 2442), (11, 1998), (18, 1221), (22, 999), (27, 814), (33, 666), (37, 594), (54, 407), (66, 333), (74, 297), (99, 222), (111, 198)]