21287847

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53353}}^1$

素因数の和:53382

約数の個数: 16

約数和(自身を含む): 34146560

約数和(自身を除く): 12858713

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53353, 160059, 373471, 1013707, 1120413, 3041121, 7095949, 21287847]

約数ペア:

[(1, 21287847), (3, 7095949), (7, 3041121), (19, 1120413), (21, 1013707), (57, 373471), (133, 160059), (399, 53353)]