12800000

素因数分解:

$2^{12}\times 5^5$

素因数の和:49

約数の個数: 78

約数和(自身を含む): 31994046

約数和(自身を除く): 19194046

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, 3125, 3200, 4000, 4096, 5000, 5120, 6250, 6400, 8000, 10000, 10240, 12500, 12800, 16000, 20000, 20480, 25000, 25600, 32000, 40000, 50000, 51200, 64000, 80000, 100000, 102400, 128000, 160000, 200000, 256000, 320000, 400000, 512000, 640000, 800000, 1280000, 1600000, 2560000, 3200000, 6400000, 12800000]

約数ペア:

[(1, 12800000), (2, 6400000), (4, 3200000), (5, 2560000), (8, 1600000), (10, 1280000), (16, 800000), (20, 640000), (25, 512000), (32, 400000), (40, 320000), (50, 256000), (64, 200000), (80, 160000), (100, 128000), (125, 102400), (128, 100000), (160, 80000), (200, 64000), (250, 51200), (256, 50000), (320, 40000), (400, 32000), (500, 25600), (512, 25000), (625, 20480), (640, 20000), (800, 16000), (1000, 12800), (1024, 12500), (1250, 10240), (1280, 10000), (1600, 8000), (2000, 6400), (2048, 6250), (2500, 5120), (2560, 5000), (3125, 4096), (3200, 4000)]