20591221

素因数分解:

$7^2\times {\mathrm{61}}^1\times {\mathrm{83}}^2$

素因数の和:241

約数の個数: 18

約数和(自身を含む): 24642582

約数和(自身を除く): 4051361

約数列:

[1, 7, 49, 61, 83, 427, 581, 2989, 4067, 5063, 6889, 35441, 48223, 248087, 337561, 420229, 2941603, 20591221]

約数ペア:

[(1, 20591221), (7, 2941603), (49, 420229), (61, 337561), (83, 248087), (427, 48223), (581, 35441), (2989, 6889), (4067, 5063)]