21800000

素因数分解:

$2^6\times 5^5\times {\mathrm{109}}^1$

素因数の和:146

約数の個数: 84

約数和(自身を含む): 54566820

約数和(自身を除く): 32766820

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 109, 125, 160, 200, 218, 250, 320, 400, 436, 500, 545, 625, 800, 872, 1000, 1090, 1250, 1600, 1744, 2000, 2180, 2500, 2725, 3125, 3488, 4000, 4360, 5000, 5450, 6250, 6976, 8000, 8720, 10000, 10900, 12500, 13625, 17440, 20000, 21800, 25000, 27250, 34880, 40000, 43600, 50000, 54500, 68125, 87200, 100000, 109000, 136250, 174400, 200000, 218000, 272500, 340625, 436000, 545000, 681250, 872000, 1090000, 1362500, 2180000, 2725000, 4360000, 5450000, 10900000, 21800000]

約数ペア:

[(1, 21800000), (2, 10900000), (4, 5450000), (5, 4360000), (8, 2725000), (10, 2180000), (16, 1362500), (20, 1090000), (25, 872000), (32, 681250), (40, 545000), (50, 436000), (64, 340625), (80, 272500), (100, 218000), (109, 200000), (125, 174400), (160, 136250), (200, 109000), (218, 100000), (250, 87200), (320, 68125), (400, 54500), (436, 50000), (500, 43600), (545, 40000), (625, 34880), (800, 27250), (872, 25000), (1000, 21800), (1090, 20000), (1250, 17440), (1600, 13625), (1744, 12500), (2000, 10900), (2180, 10000), (2500, 8720), (2725, 8000), (3125, 6976), (3488, 6250), (4000, 5450), (4360, 5000)]