21278829

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{257}}^1$

素因数の和:477

約数の個数: 32

約数和(自身を含む): 33634944

約数和(自身を除く): 12356115

約数列:

[1, 3, 11, 13, 33, 39, 143, 193, 257, 429, 579, 771, 2123, 2509, 2827, 3341, 6369, 7527, 8481, 10023, 27599, 36751, 49601, 82797, 110253, 148803, 545611, 644813, 1636833, 1934439, 7092943, 21278829]

約数ペア:

[(1, 21278829), (3, 7092943), (11, 1934439), (13, 1636833), (33, 644813), (39, 545611), (143, 148803), (193, 110253), (257, 82797), (429, 49601), (579, 36751), (771, 27599), (2123, 10023), (2509, 8481), (2827, 7527), (3341, 6369)]