661385

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{251}}^1$

素因数の和:304

約数の個数: 16

約数和(自身を含む): 870912

約数和(自身を除く): 209527

約数列:

[1, 5, 17, 31, 85, 155, 251, 527, 1255, 2635, 4267, 7781, 21335, 38905, 132277, 661385]

約数ペア:

[(1, 661385), (5, 132277), (17, 38905), (31, 21335), (85, 7781), (155, 4267), (251, 2635), (527, 1255)]