21015963

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{109}}^1\times {\mathrm{193}}^1$

素因数の和:348

約数の個数: 32

約数和(自身を含む): 32436800

約数和(自身を除く): 11420837

約数列:

[1, 3, 9, 27, 37, 109, 111, 193, 327, 333, 579, 981, 999, 1737, 2943, 4033, 5211, 7141, 12099, 21037, 21423, 36297, 63111, 64269, 108891, 189333, 192807, 567999, 778369, 2335107, 7005321, 21015963]

約数ペア:

[(1, 21015963), (3, 7005321), (9, 2335107), (27, 778369), (37, 567999), (109, 192807), (111, 189333), (193, 108891), (327, 64269), (333, 63111), (579, 36297), (981, 21423), (999, 21037), (1737, 12099), (2943, 7141), (4033, 5211)]