21521661

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53939}}^1$

素因数の和:53968

約数の個数: 16

約数和(自身を含む): 34521600

約数和(自身を除く): 12999939

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53939, 161817, 377573, 1024841, 1132719, 3074523, 7173887, 21521661]

約数ペア:

[(1, 21521661), (3, 7173887), (7, 3074523), (19, 1132719), (21, 1024841), (57, 377573), (133, 161817), (399, 53939)]