21816921

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{54679}}^1$

素因数の和:54708

約数の個数: 16

約数和(自身を含む): 34995200

約数和(自身を除く): 13178279

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 54679, 164037, 382753, 1038901, 1148259, 3116703, 7272307, 21816921]

約数ペア:

[(1, 21816921), (3, 7272307), (7, 3116703), (19, 1148259), (21, 1038901), (57, 382753), (133, 164037), (399, 54679)]