21780489

素因数分解:

$3^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1\times {\mathrm{1549}}^1$

素因数の和:1704

約数の個数: 16

約数和(自身を含む): 30008000

約数和(自身を除く): 8227511

約数列:

[1, 3, 43, 109, 129, 327, 1549, 4647, 4687, 14061, 66607, 168841, 199821, 506523, 7260163, 21780489]

約数ペア:

[(1, 21780489), (3, 7260163), (43, 506523), (109, 199821), (129, 168841), (327, 66607), (1549, 14061), (4647, 4687)]