21387393

素因数分解:

$3^2\times {\mathrm{61}}^1\times {\mathrm{163}}^1\times {\mathrm{239}}^1$

素因数の和:469

約数の個数: 24

約数和(自身を含む): 31724160

約数和(自身を除く): 10336767

約数列:

[1, 3, 9, 61, 163, 183, 239, 489, 549, 717, 1467, 2151, 9943, 14579, 29829, 38957, 43737, 89487, 116871, 131211, 350613, 2376377, 7129131, 21387393]

約数ペア:

[(1, 21387393), (3, 7129131), (9, 2376377), (61, 350613), (163, 131211), (183, 116871), (239, 89487), (489, 43737), (549, 38957), (717, 29829), (1467, 14579), (2151, 9943)]