21019959

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{397}}^1$

素因数の和:496

約数の個数: 32

約数和(自身を含む): 32667840

約数和(自身を除く): 11647881

約数列:

[1, 3, 9, 27, 37, 53, 111, 159, 333, 397, 477, 999, 1191, 1431, 1961, 3573, 5883, 10719, 14689, 17649, 21041, 44067, 52947, 63123, 132201, 189369, 396603, 568107, 778517, 2335551, 7006653, 21019959]

約数ペア:

[(1, 21019959), (3, 7006653), (9, 2335551), (27, 778517), (37, 568107), (53, 396603), (111, 189369), (159, 132201), (333, 63123), (397, 52947), (477, 44067), (999, 21041), (1191, 17649), (1431, 14689), (1961, 10719), (3573, 5883)]