21079971

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{2999}}^1$

素因数の和:3087

約数の個数: 24

約数和(自身を含む): 33696000

約数和(自身を除く): 12616029

約数列:

[1, 3, 9, 11, 33, 71, 99, 213, 639, 781, 2343, 2999, 7029, 8997, 26991, 32989, 98967, 212929, 296901, 638787, 1916361, 2342219, 7026657, 21079971]

約数ペア:

[(1, 21079971), (3, 7026657), (9, 2342219), (11, 1916361), (33, 638787), (71, 296901), (99, 212929), (213, 98967), (639, 32989), (781, 26991), (2343, 8997), (2999, 7029)]