21509195

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{151}}^1\times {\mathrm{919}}^1$

素因数の和:1106

約数の個数: 16

約数和(自身を含む): 26849280

約数和(自身を除く): 5340085

約数列:

[1, 5, 31, 151, 155, 755, 919, 4595, 4681, 23405, 28489, 138769, 142445, 693845, 4301839, 21509195]

約数ペア:

[(1, 21509195), (5, 4301839), (31, 693845), (151, 142445), (155, 138769), (755, 28489), (919, 23405), (4595, 4681)]