21000000

素因数分解:

$2^6\times 3^1\times 5^6\times 7^1$

素因数の和:52

約数の個数: 196

約数和(自身を含む): 79373984

約数和(自身を除く): 58373984

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 25, 28, 30, 32, 35, 40, 42, 48, 50, 56, 60, 64, 70, 75, 80, 84, 96, 100, 105, 112, 120, 125, 140, 150, 160, 168, 175, 192, 200, 210, 224, 240, 250, 280, 300, 320, 336, 350, 375, 400, 420, 448, 480, 500, 525, 560, 600, 625, 672, 700, 750, 800, 840, 875, 960, 1000, 1050, 1120, 1200, 1250, 1344, 1400, 1500, 1600, 1680, 1750, 1875, 2000, 2100, 2240, 2400, 2500, 2625, 2800, 3000, 3125, 3360, 3500, 3750, 4000, 4200, 4375, 4800, 5000, 5250, 5600, 6000, 6250, 6720, 7000, 7500, 8000, 8400, 8750, 9375, 10000, 10500, 11200, 12000, 12500, 13125, 14000, 15000, 15625, 16800, 17500, 18750, 20000, 21000, 21875, 24000, 25000, 26250, 28000, 30000, 31250, 33600, 35000, 37500, 40000, 42000, 43750, 46875, 50000, 52500, 56000, 60000, 62500, 65625, 70000, 75000, 84000, 87500, 93750, 100000, 105000, 109375, 120000, 125000, 131250, 140000, 150000, 168000, 175000, 187500, 200000, 210000, 218750, 250000, 262500, 280000, 300000, 328125, 350000, 375000, 420000, 437500, 500000, 525000, 600000, 656250, 700000, 750000, 840000, 875000, 1000000, 1050000, 1312500, 1400000, 1500000, 1750000, 2100000, 2625000, 3000000, 3500000, 4200000, 5250000, 7000000, 10500000, 21000000]

約数ペア:

[(1, 21000000), (2, 10500000), (3, 7000000), (4, 5250000), (5, 4200000), (6, 3500000), (7, 3000000), (8, 2625000), (10, 2100000), (12, 1750000), (14, 1500000), (15, 1400000), (16, 1312500), (20, 1050000), (21, 1000000), (24, 875000), (25, 840000), (28, 750000), (30, 700000), (32, 656250), (35, 600000), (40, 525000), (42, 500000), (48, 437500), (50, 420000), (56, 375000), (60, 350000), (64, 328125), (70, 300000), (75, 280000), (80, 262500), (84, 250000), (96, 218750), (100, 210000), (105, 200000), (112, 187500), (120, 175000), (125, 168000), (140, 150000), (150, 140000), (160, 131250), (168, 125000), (175, 120000), (192, 109375), (200, 105000), (210, 100000), (224, 93750), (240, 87500), (250, 84000), (280, 75000), (300, 70000), (320, 65625), (336, 62500), (350, 60000), (375, 56000), (400, 52500), (420, 50000), (448, 46875), (480, 43750), (500, 42000), (525, 40000), (560, 37500), (600, 35000), (625, 33600), (672, 31250), (700, 30000), (750, 28000), (800, 26250), (840, 25000), (875, 24000), (960, 21875), (1000, 21000), (1050, 20000), (1120, 18750), (1200, 17500), (1250, 16800), (1344, 15625), (1400, 15000), (1500, 14000), (1600, 13125), (1680, 12500), (1750, 12000), (1875, 11200), (2000, 10500), (2100, 10000), (2240, 9375), (2400, 8750), (2500, 8400), (2625, 8000), (2800, 7500), (3000, 7000), (3125, 6720), (3360, 6250), (3500, 6000), (3750, 5600), (4000, 5250), (4200, 5000), (4375, 4800)]