51440000

素因数分解:

$2^7\times 5^4\times {\mathrm{643}}^1$

素因数の和:677

約数の個数: 80

約数和(自身を含む): 128255820

約数和(自身を除く): 76815820

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 320, 400, 500, 625, 640, 643, 800, 1000, 1250, 1286, 1600, 2000, 2500, 2572, 3200, 3215, 4000, 5000, 5144, 6430, 8000, 10000, 10288, 12860, 16000, 16075, 20000, 20576, 25720, 32150, 40000, 41152, 51440, 64300, 80000, 80375, 82304, 102880, 128600, 160750, 205760, 257200, 321500, 401875, 411520, 514400, 643000, 803750, 1028800, 1286000, 1607500, 2057600, 2572000, 3215000, 5144000, 6430000, 10288000, 12860000, 25720000, 51440000]

約数ペア:

[(1, 51440000), (2, 25720000), (4, 12860000), (5, 10288000), (8, 6430000), (10, 5144000), (16, 3215000), (20, 2572000), (25, 2057600), (32, 1607500), (40, 1286000), (50, 1028800), (64, 803750), (80, 643000), (100, 514400), (125, 411520), (128, 401875), (160, 321500), (200, 257200), (250, 205760), (320, 160750), (400, 128600), (500, 102880), (625, 82304), (640, 80375), (643, 80000), (800, 64300), (1000, 51440), (1250, 41152), (1286, 40000), (1600, 32150), (2000, 25720), (2500, 20576), (2572, 20000), (3200, 16075), (3215, 16000), (4000, 12860), (5000, 10288), (5144, 10000), (6430, 8000)]