21387921

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{269}}^1\times {\mathrm{1559}}^1$

素因数の和:1848

約数の個数: 16

約数和(自身を含む): 30326400

約数和(自身を除く): 8938479

約数列:

[1, 3, 17, 51, 269, 807, 1559, 4573, 4677, 13719, 26503, 79509, 419371, 1258113, 7129307, 21387921]

約数ペア:

[(1, 21387921), (3, 7129307), (17, 1258113), (51, 419371), (269, 79509), (807, 26503), (1559, 13719), (4573, 4677)]