21287085

素因数分解:

$3^1\times 5^1\times {\mathrm{401}}^1\times {\mathrm{3539}}^1$

素因数の和:3948

約数の個数: 16

約数和(自身を含む): 34153920

約数和(自身を除く): 12866835

約数列:

[1, 3, 5, 15, 401, 1203, 2005, 3539, 6015, 10617, 17695, 53085, 1419139, 4257417, 7095695, 21287085]

約数ペア:

[(1, 21287085), (3, 7095695), (5, 4257417), (15, 1419139), (401, 53085), (1203, 17695), (2005, 10617), (3539, 6015)]