21107945

素因数分解:

$5^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{1607}}^1$

素因数の和:1720

約数の個数: 16

約数和(自身を含む): 26396928

約数和(自身を除く): 5288983

約数列:

[1, 5, 37, 71, 185, 355, 1607, 2627, 8035, 13135, 59459, 114097, 297295, 570485, 4221589, 21107945]

約数ペア:

[(1, 21107945), (5, 4221589), (37, 570485), (71, 297295), (185, 114097), (355, 59459), (1607, 13135), (2627, 8035)]