646400

素因数分解:

$2^8\times 5^2\times {\mathrm{101}}^1$

素因数の和:127

約数の個数: 54

約数和(自身を含む): 1615782

約数和(自身を除く): 969382

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 101, 128, 160, 200, 202, 256, 320, 400, 404, 505, 640, 800, 808, 1010, 1280, 1600, 1616, 2020, 2525, 3200, 3232, 4040, 5050, 6400, 6464, 8080, 10100, 12928, 16160, 20200, 25856, 32320, 40400, 64640, 80800, 129280, 161600, 323200, 646400]

約数ペア:

[(1, 646400), (2, 323200), (4, 161600), (5, 129280), (8, 80800), (10, 64640), (16, 40400), (20, 32320), (25, 25856), (32, 20200), (40, 16160), (50, 12928), (64, 10100), (80, 8080), (100, 6464), (101, 6400), (128, 5050), (160, 4040), (200, 3232), (202, 3200), (256, 2525), (320, 2020), (400, 1616), (404, 1600), (505, 1280), (640, 1010), (800, 808)]