20561215

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{109}}^1\times {\mathrm{1217}}^1$

素因数の和:1362

約数の個数: 16

約数和(自身を含む): 25724160

約数和(自身を除く): 5162945

約数列:

[1, 5, 31, 109, 155, 545, 1217, 3379, 6085, 16895, 37727, 132653, 188635, 663265, 4112243, 20561215]

約数ペア:

[(1, 20561215), (5, 4112243), (31, 663265), (109, 188635), (155, 132653), (545, 37727), (1217, 16895), (3379, 6085)]