2500000

素因数分解:

$2^5\times 5^7$

素因数の和:45

約数の個数: 48

約数和(自身を含む): 6152328

約数和(自身を除く): 3652328

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 625, 800, 1000, 1250, 2000, 2500, 3125, 4000, 5000, 6250, 10000, 12500, 15625, 20000, 25000, 31250, 50000, 62500, 78125, 100000, 125000, 156250, 250000, 312500, 500000, 625000, 1250000, 2500000]

約数ペア:

[(1, 2500000), (2, 1250000), (4, 625000), (5, 500000), (8, 312500), (10, 250000), (16, 156250), (20, 125000), (25, 100000), (32, 78125), (40, 62500), (50, 50000), (80, 31250), (100, 25000), (125, 20000), (160, 15625), (200, 12500), (250, 10000), (400, 6250), (500, 5000), (625, 4000), (800, 3125), (1000, 2500), (1250, 2000)]