80420440

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{7823}}^1$

素因数の和:8091

約数の個数: 32

約数和(自身を含む): 181673280

約数和(自身を除く): 101252840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2056, 2570, 5140, 7823, 10280, 15646, 31292, 39115, 62584, 78230, 156460, 312920, 2010511, 4021022, 8042044, 10052555, 16084088, 20105110, 40210220, 80420440]

約数ペア:

[(1, 80420440), (2, 40210220), (4, 20105110), (5, 16084088), (8, 10052555), (10, 8042044), (20, 4021022), (40, 2010511), (257, 312920), (514, 156460), (1028, 78230), (1285, 62584), (2056, 39115), (2570, 31292), (5140, 15646), (7823, 10280)]