80000000

素因数分解:

$2^{10}\times 5^7$

素因数の和:55

約数の個数: 88

約数和(自身を含む): 199901832

約数和(自身を除く): 119901832

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, 2500, 2560, 3125, 3200, 4000, 5000, 5120, 6250, 6400, 8000, 10000, 12500, 12800, 15625, 16000, 20000, 25000, 25600, 31250, 32000, 40000, 50000, 62500, 64000, 78125, 80000, 100000, 125000, 128000, 156250, 160000, 200000, 250000, 312500, 320000, 400000, 500000, 625000, 640000, 800000, 1000000, 1250000, 1600000, 2000000, 2500000, 3200000, 4000000, 5000000, 8000000, 10000000, 16000000, 20000000, 40000000, 80000000]

約数ペア:

[(1, 80000000), (2, 40000000), (4, 20000000), (5, 16000000), (8, 10000000), (10, 8000000), (16, 5000000), (20, 4000000), (25, 3200000), (32, 2500000), (40, 2000000), (50, 1600000), (64, 1250000), (80, 1000000), (100, 800000), (125, 640000), (128, 625000), (160, 500000), (200, 400000), (250, 320000), (256, 312500), (320, 250000), (400, 200000), (500, 160000), (512, 156250), (625, 128000), (640, 125000), (800, 100000), (1000, 80000), (1024, 78125), (1250, 64000), (1280, 62500), (1600, 50000), (2000, 40000), (2500, 32000), (2560, 31250), (3125, 25600), (3200, 25000), (4000, 20000), (5000, 16000), (5120, 15625), (6250, 12800), (6400, 12500), (8000, 10000)]