21215555

素因数分解:

$5^1\times {\mathrm{43}}^1\times {\mathrm{101}}^1\times {\mathrm{977}}^1$

素因数の和:1126

約数の個数: 16

約数和(自身を含む): 26335584

約数和(自身を除く): 5120029

約数列:

[1, 5, 43, 101, 215, 505, 977, 4343, 4885, 21715, 42011, 98677, 210055, 493385, 4243111, 21215555]

約数ペア:

[(1, 21215555), (5, 4243111), (43, 493385), (101, 210055), (215, 98677), (505, 42011), (977, 21715), (4343, 4885)]