21027005

素因数分解:

$5^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{971}}^1$

素因数の和:1108

約数の個数: 16

約数和(自身を含む): 26034048

約数和(自身を除く): 5007043

約数列:

[1, 5, 61, 71, 305, 355, 971, 4331, 4855, 21655, 59231, 68941, 296155, 344705, 4205401, 21027005]

約数ペア:

[(1, 21027005), (5, 4205401), (61, 344705), (71, 296155), (305, 68941), (355, 59231), (971, 21655), (4331, 4855)]