21437500

素因数分解:

$2^2\times 5^6\times 7^3$

素因数の和:55

約数の個数: 84

約数和(自身を含む): 54686800

約数和(自身を除く): 33249300

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 25, 28, 35, 49, 50, 70, 98, 100, 125, 140, 175, 196, 245, 250, 343, 350, 490, 500, 625, 686, 700, 875, 980, 1225, 1250, 1372, 1715, 1750, 2450, 2500, 3125, 3430, 3500, 4375, 4900, 6125, 6250, 6860, 8575, 8750, 12250, 12500, 15625, 17150, 17500, 21875, 24500, 30625, 31250, 34300, 42875, 43750, 61250, 62500, 85750, 87500, 109375, 122500, 153125, 171500, 214375, 218750, 306250, 428750, 437500, 612500, 765625, 857500, 1071875, 1531250, 2143750, 3062500, 4287500, 5359375, 10718750, 21437500]

約数ペア:

[(1, 21437500), (2, 10718750), (4, 5359375), (5, 4287500), (7, 3062500), (10, 2143750), (14, 1531250), (20, 1071875), (25, 857500), (28, 765625), (35, 612500), (49, 437500), (50, 428750), (70, 306250), (98, 218750), (100, 214375), (125, 171500), (140, 153125), (175, 122500), (196, 109375), (245, 87500), (250, 85750), (343, 62500), (350, 61250), (490, 43750), (500, 42875), (625, 34300), (686, 31250), (700, 30625), (875, 24500), (980, 21875), (1225, 17500), (1250, 17150), (1372, 15625), (1715, 12500), (1750, 12250), (2450, 8750), (2500, 8575), (3125, 6860), (3430, 6250), (3500, 6125), (4375, 4900)]