21216987

素因数分解:

$3^2\times {\mathrm{11}}^2\times {\mathrm{19483}}^1$

素因数の和:19511

約数の個数: 18

約数和(自身を含む): 33687836

約数和(自身を除く): 12470849

約数列:

[1, 3, 9, 11, 33, 99, 121, 363, 1089, 19483, 58449, 175347, 214313, 642939, 1928817, 2357443, 7072329, 21216987]

約数ペア:

[(1, 21216987), (3, 7072329), (9, 2357443), (11, 1928817), (33, 642939), (99, 214313), (121, 175347), (363, 58449), (1089, 19483)]