21389055

素因数分解:

$3^1\times 5^1\times {\mathrm{1091}}^1\times {\mathrm{1307}}^1$

素因数の和:2406

約数の個数: 16

約数和(自身を含む): 34280064

約数和(自身を除く): 12891009

約数列:

[1, 3, 5, 15, 1091, 1307, 3273, 3921, 5455, 6535, 16365, 19605, 1425937, 4277811, 7129685, 21389055]

約数ペア:

[(1, 21389055), (3, 7129685), (5, 4277811), (15, 1425937), (1091, 19605), (1307, 16365), (3273, 6535), (3921, 5455)]