21728811

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{107}}^1\times {\mathrm{127}}^1$

素因数の和:291

約数の個数: 32

約数和(自身を含む): 32514048

約数和(自身を除く): 10785237

約数列:

[1, 3, 13, 39, 41, 107, 123, 127, 321, 381, 533, 1391, 1599, 1651, 4173, 4387, 4953, 5207, 13161, 13589, 15621, 40767, 57031, 67691, 171093, 176657, 203073, 529971, 557149, 1671447, 7242937, 21728811]

約数ペア:

[(1, 21728811), (3, 7242937), (13, 1671447), (39, 557149), (41, 529971), (107, 203073), (123, 176657), (127, 171093), (321, 67691), (381, 57031), (533, 40767), (1391, 15621), (1599, 13589), (1651, 13161), (4173, 5207), (4387, 4953)]