19778680

素因数分解:

$2^3\times 5^1\times {\mathrm{643}}^1\times {\mathrm{769}}^1$

素因数の和:1423

約数の個数: 32

約数和(自身を含む): 44629200

約数和(自身を除く): 24850520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 643, 769, 1286, 1538, 2572, 3076, 3215, 3845, 5144, 6152, 6430, 7690, 12860, 15380, 25720, 30760, 494467, 988934, 1977868, 2472335, 3955736, 4944670, 9889340, 19778680]

約数ペア:

[(1, 19778680), (2, 9889340), (4, 4944670), (5, 3955736), (8, 2472335), (10, 1977868), (20, 988934), (40, 494467), (643, 30760), (769, 25720), (1286, 15380), (1538, 12860), (2572, 7690), (3076, 6430), (3215, 6152), (3845, 5144)]