21508839

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{19751}}^1$

素因数の和:19779

約数の個数: 18

約数和(自身を含む): 34151208

約数和(自身を除く): 12642369

約数列:

[1, 3, 9, 11, 33, 99, 121, 363, 1089, 19751, 59253, 177759, 217261, 651783, 1955349, 2389871, 7169613, 21508839]

約数ペア:

[(1, 21508839), (3, 7169613), (9, 2389871), (11, 1955349), (33, 651783), (99, 217261), (121, 177759), (363, 59253), (1089, 19751)]