21020115

素因数分解:

$3^1\times 5^1\times {\mathrm{271}}^1\times {\mathrm{5171}}^1$

素因数の和:5450

約数の個数: 16

約数和(自身を含む): 33762816

約数和(自身を除く): 12742701

約数列:

[1, 3, 5, 15, 271, 813, 1355, 4065, 5171, 15513, 25855, 77565, 1401341, 4204023, 7006705, 21020115]

約数ペア:

[(1, 21020115), (3, 7006705), (5, 4204023), (15, 1401341), (271, 77565), (813, 25855), (1355, 15513), (4065, 5171)]