81001215

素因数分解:

$3^4\times 5^1\times {\mathrm{200003}}^1$

素因数の和:200020

約数の個数: 20

約数和(自身を含む): 145202904

約数和(自身を除く): 64201689

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 200003, 600009, 1000015, 1800027, 3000045, 5400081, 9000135, 16200243, 27000405, 81001215]

約数ペア:

[(1, 81001215), (3, 27000405), (5, 16200243), (9, 9000135), (15, 5400081), (27, 3000045), (45, 1800027), (81, 1000015), (135, 600009), (405, 200003)]