25000000

素因数分解:

$2^6\times 5^8$

素因数の和:52

約数の個数: 63

約数和(自身を含む): 62011687

約数和(自身を除く): 37011687

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 160, 200, 250, 320, 400, 500, 625, 800, 1000, 1250, 1600, 2000, 2500, 3125, 4000, 5000, 6250, 8000, 10000, 12500, 15625, 20000, 25000, 31250, 40000, 50000, 62500, 78125, 100000, 125000, 156250, 200000, 250000, 312500, 390625, 500000, 625000, 781250, 1000000, 1250000, 1562500, 2500000, 3125000, 5000000, 6250000, 12500000, 25000000]

約数ペア:

[(1, 25000000), (2, 12500000), (4, 6250000), (5, 5000000), (8, 3125000), (10, 2500000), (16, 1562500), (20, 1250000), (25, 1000000), (32, 781250), (40, 625000), (50, 500000), (64, 390625), (80, 312500), (100, 250000), (125, 200000), (160, 156250), (200, 125000), (250, 100000), (320, 78125), (400, 62500), (500, 50000), (625, 40000), (800, 31250), (1000, 25000), (1250, 20000), (1600, 15625), (2000, 12500), (2500, 10000), (3125, 8000), (4000, 6250)]