21068505

素因数分解:

$3^4\times 5^1\times {\mathrm{52021}}^1$

素因数の和:52038

約数の個数: 20

約数和(自身を含む): 37767972

約数和(自身を除く): 16699467

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52021, 156063, 260105, 468189, 780315, 1404567, 2340945, 4213701, 7022835, 21068505]

約数ペア:

[(1, 21068505), (3, 7022835), (5, 4213701), (9, 2340945), (15, 1404567), (27, 780315), (45, 468189), (81, 260105), (135, 156063), (405, 52021)]