18909981

素因数分解:

$3^2\times {\mathrm{43}}^1\times {\mathrm{131}}^1\times {\mathrm{373}}^1$

素因数の和:553

約数の個数: 24

約数和(自身を含む): 28238496

約数和(自身を除く): 9328515

約数列:

[1, 3, 9, 43, 129, 131, 373, 387, 393, 1119, 1179, 3357, 5633, 16039, 16899, 48117, 48863, 50697, 144351, 146589, 439767, 2101109, 6303327, 18909981]

約数ペア:

[(1, 18909981), (3, 6303327), (9, 2101109), (43, 439767), (129, 146589), (131, 144351), (373, 50697), (387, 48863), (393, 48117), (1119, 16899), (1179, 16039), (3357, 5633)]