21016815

素因数分解:

$3^1\times 5^1\times {\mathrm{181}}^1\times {\mathrm{7741}}^1$

素因数の和:7930

約数の個数: 16

約数和(自身を含む): 33817056

約数和(自身を除く): 12800241

約数列:

[1, 3, 5, 15, 181, 543, 905, 2715, 7741, 23223, 38705, 116115, 1401121, 4203363, 7005605, 21016815]

約数ペア:

[(1, 21016815), (3, 7005605), (5, 4203363), (15, 1401121), (181, 116115), (543, 38705), (905, 23223), (2715, 7741)]