128720000

素因数分解:

$2^7\times 5^4\times {\mathrm{1609}}^1$

素因数の和:1643

約数の個数: 80

約数和(自身を含む): 320639550

約数和(自身を除く): 191919550

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, 800, 1000, 1250, 1600, 1609, 2000, 2500, 3200, 3218, 4000, 5000, 6436, 8000, 8045, 10000, 12872, 16000, 16090, 20000, 25744, 32180, 40000, 40225, 51488, 64360, 80000, 80450, 102976, 128720, 160900, 201125, 205952, 257440, 321800, 402250, 514880, 643600, 804500, 1005625, 1029760, 1287200, 1609000, 2011250, 2574400, 3218000, 4022500, 5148800, 6436000, 8045000, 12872000, 16090000, 25744000, 32180000, 64360000, 128720000]

約数ペア:

[(1, 128720000), (2, 64360000), (4, 32180000), (5, 25744000), (8, 16090000), (10, 12872000), (16, 8045000), (20, 6436000), (25, 5148800), (32, 4022500), (40, 3218000), (50, 2574400), (64, 2011250), (80, 1609000), (100, 1287200), (125, 1029760), (128, 1005625), (160, 804500), (200, 643600), (250, 514880), (320, 402250), (400, 321800), (500, 257440), (625, 205952), (640, 201125), (800, 160900), (1000, 128720), (1250, 102976), (1600, 80450), (1609, 80000), (2000, 64360), (2500, 51488), (3200, 40225), (3218, 40000), (4000, 32180), (5000, 25744), (6436, 20000), (8000, 16090), (8045, 16000), (10000, 12872)]