1646080

素因数分解:

$2^9\times 5^1\times {\mathrm{643}}^1$

素因数の和:666

約数の個数: 40

約数和(自身を含む): 3952872

約数和(自身を除く): 2306792

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 643, 1280, 1286, 2560, 2572, 3215, 5144, 6430, 10288, 12860, 20576, 25720, 41152, 51440, 82304, 102880, 164608, 205760, 329216, 411520, 823040, 1646080]

約数ペア:

[(1, 1646080), (2, 823040), (4, 411520), (5, 329216), (8, 205760), (10, 164608), (16, 102880), (20, 82304), (32, 51440), (40, 41152), (64, 25720), (80, 20576), (128, 12860), (160, 10288), (256, 6430), (320, 5144), (512, 3215), (640, 2572), (643, 2560), (1280, 1286)]