21007749

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{1423}}^1$

素因数の和:1489

約数の個数: 32

約数和(自身を含む): 34631680

約数和(自身を除く): 13623931

約数列:

[1, 3, 7, 19, 21, 37, 57, 111, 133, 259, 399, 703, 777, 1423, 2109, 4269, 4921, 9961, 14763, 27037, 29883, 52651, 81111, 157953, 189259, 368557, 567777, 1000369, 1105671, 3001107, 7002583, 21007749]

約数ペア:

[(1, 21007749), (3, 7002583), (7, 3001107), (19, 1105671), (21, 1000369), (37, 567777), (57, 368557), (111, 189259), (133, 157953), (259, 81111), (399, 52651), (703, 29883), (777, 27037), (1423, 14763), (2109, 9961), (4269, 4921)]