21045760

素因数分解:

$2^9\times 5^1\times {\mathrm{8221}}^1$

素因数の和:8244

約数の個数: 40

約数和(自身を含む): 50466636

約数和(自身を除く): 29420876

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 8221, 16442, 32884, 41105, 65768, 82210, 131536, 164420, 263072, 328840, 526144, 657680, 1052288, 1315360, 2104576, 2630720, 4209152, 5261440, 10522880, 21045760]

約数ペア:

[(1, 21045760), (2, 10522880), (4, 5261440), (5, 4209152), (8, 2630720), (10, 2104576), (16, 1315360), (20, 1052288), (32, 657680), (40, 526144), (64, 328840), (80, 263072), (128, 164420), (160, 131536), (256, 82210), (320, 65768), (512, 41105), (640, 32884), (1280, 16442), (2560, 8221)]