21280000

素因数分解:

$2^8\times 5^4\times 7^1\times {\mathrm{19}}^1$

素因数の和:62

約数の個数: 180

約数和(自身を含む): 63854560

約数和(自身を除く): 42574560

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 19, 20, 25, 28, 32, 35, 38, 40, 50, 56, 64, 70, 76, 80, 95, 100, 112, 125, 128, 133, 140, 152, 160, 175, 190, 200, 224, 250, 256, 266, 280, 304, 320, 350, 380, 400, 448, 475, 500, 532, 560, 608, 625, 640, 665, 700, 760, 800, 875, 896, 950, 1000, 1064, 1120, 1216, 1250, 1280, 1330, 1400, 1520, 1600, 1750, 1792, 1900, 2000, 2128, 2240, 2375, 2432, 2500, 2660, 2800, 3040, 3200, 3325, 3500, 3800, 4000, 4256, 4375, 4480, 4750, 4864, 5000, 5320, 5600, 6080, 6400, 6650, 7000, 7600, 8000, 8512, 8750, 8960, 9500, 10000, 10640, 11200, 11875, 12160, 13300, 14000, 15200, 16000, 16625, 17024, 17500, 19000, 20000, 21280, 22400, 23750, 24320, 26600, 28000, 30400, 32000, 33250, 34048, 35000, 38000, 40000, 42560, 44800, 47500, 53200, 56000, 60800, 66500, 70000, 76000, 80000, 83125, 85120, 95000, 106400, 112000, 121600, 133000, 140000, 152000, 160000, 166250, 170240, 190000, 212800, 224000, 266000, 280000, 304000, 332500, 380000, 425600, 532000, 560000, 608000, 665000, 760000, 851200, 1064000, 1120000, 1330000, 1520000, 2128000, 2660000, 3040000, 4256000, 5320000, 10640000, 21280000]

約数ペア:

[(1, 21280000), (2, 10640000), (4, 5320000), (5, 4256000), (7, 3040000), (8, 2660000), (10, 2128000), (14, 1520000), (16, 1330000), (19, 1120000), (20, 1064000), (25, 851200), (28, 760000), (32, 665000), (35, 608000), (38, 560000), (40, 532000), (50, 425600), (56, 380000), (64, 332500), (70, 304000), (76, 280000), (80, 266000), (95, 224000), (100, 212800), (112, 190000), (125, 170240), (128, 166250), (133, 160000), (140, 152000), (152, 140000), (160, 133000), (175, 121600), (190, 112000), (200, 106400), (224, 95000), (250, 85120), (256, 83125), (266, 80000), (280, 76000), (304, 70000), (320, 66500), (350, 60800), (380, 56000), (400, 53200), (448, 47500), (475, 44800), (500, 42560), (532, 40000), (560, 38000), (608, 35000), (625, 34048), (640, 33250), (665, 32000), (700, 30400), (760, 28000), (800, 26600), (875, 24320), (896, 23750), (950, 22400), (1000, 21280), (1064, 20000), (1120, 19000), (1216, 17500), (1250, 17024), (1280, 16625), (1330, 16000), (1400, 15200), (1520, 14000), (1600, 13300), (1750, 12160), (1792, 11875), (1900, 11200), (2000, 10640), (2128, 10000), (2240, 9500), (2375, 8960), (2432, 8750), (2500, 8512), (2660, 8000), (2800, 7600), (3040, 7000), (3200, 6650), (3325, 6400), (3500, 6080), (3800, 5600), (4000, 5320), (4256, 5000), (4375, 4864), (4480, 4750)]