81920000

素因数分解:

$2^{17}\times 5^4$

素因数の和:54

約数の個数: 90

約数和(自身を含む): 204733683

約数和(自身を除く): 122813683

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 256, 320, 400, 500, 512, 625, 640, 800, 1000, 1024, 1250, 1280, 1600, 2000, 2048, 2500, 2560, 3200, 4000, 4096, 5000, 5120, 6400, 8000, 8192, 10000, 10240, 12800, 16000, 16384, 20000, 20480, 25600, 32000, 32768, 40000, 40960, 51200, 64000, 65536, 80000, 81920, 102400, 128000, 131072, 160000, 163840, 204800, 256000, 320000, 327680, 409600, 512000, 640000, 655360, 819200, 1024000, 1280000, 1638400, 2048000, 2560000, 3276800, 4096000, 5120000, 8192000, 10240000, 16384000, 20480000, 40960000, 81920000]

約数ペア:

[(1, 81920000), (2, 40960000), (4, 20480000), (5, 16384000), (8, 10240000), (10, 8192000), (16, 5120000), (20, 4096000), (25, 3276800), (32, 2560000), (40, 2048000), (50, 1638400), (64, 1280000), (80, 1024000), (100, 819200), (125, 655360), (128, 640000), (160, 512000), (200, 409600), (250, 327680), (256, 320000), (320, 256000), (400, 204800), (500, 163840), (512, 160000), (625, 131072), (640, 128000), (800, 102400), (1000, 81920), (1024, 80000), (1250, 65536), (1280, 64000), (1600, 51200), (2000, 40960), (2048, 40000), (2500, 32768), (2560, 32000), (3200, 25600), (4000, 20480), (4096, 20000), (5000, 16384), (5120, 16000), (6400, 12800), (8000, 10240), (8192, 10000)]