1250000

素因数分解:

$2^4\times 5^7$

素因数の和:43

約数の個数: 40

約数和(自身を含む): 3027336

約数和(自身を除く): 1777336

約数列:

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

約数ペア:

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