19980000

素因数分解:

$2^5\times 3^3\times 5^4\times {\mathrm{37}}^1$

素因数の和:76

約数の個数: 240

約数和(自身を含む): 74788560

約数和(自身を除く): 54808560

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 27, 30, 32, 36, 37, 40, 45, 48, 50, 54, 60, 72, 74, 75, 80, 90, 96, 100, 108, 111, 120, 125, 135, 144, 148, 150, 160, 180, 185, 200, 216, 222, 225, 240, 250, 270, 288, 296, 300, 333, 360, 370, 375, 400, 432, 444, 450, 480, 500, 540, 555, 592, 600, 625, 666, 675, 720, 740, 750, 800, 864, 888, 900, 925, 999, 1000, 1080, 1110, 1125, 1184, 1200, 1250, 1332, 1350, 1440, 1480, 1500, 1665, 1776, 1800, 1850, 1875, 1998, 2000, 2160, 2220, 2250, 2400, 2500, 2664, 2700, 2775, 2960, 3000, 3330, 3375, 3552, 3600, 3700, 3750, 3996, 4000, 4320, 4440, 4500, 4625, 4995, 5000, 5328, 5400, 5550, 5625, 5920, 6000, 6660, 6750, 7200, 7400, 7500, 7992, 8325, 8880, 9000, 9250, 9990, 10000, 10656, 10800, 11100, 11250, 12000, 13320, 13500, 13875, 14800, 15000, 15984, 16650, 16875, 17760, 18000, 18500, 19980, 20000, 21600, 22200, 22500, 23125, 24975, 26640, 27000, 27750, 29600, 30000, 31968, 33300, 33750, 36000, 37000, 39960, 41625, 44400, 45000, 46250, 49950, 53280, 54000, 55500, 60000, 66600, 67500, 69375, 74000, 79920, 83250, 88800, 90000, 92500, 99900, 108000, 111000, 124875, 133200, 135000, 138750, 148000, 159840, 166500, 180000, 185000, 199800, 208125, 222000, 249750, 266400, 270000, 277500, 333000, 370000, 399600, 416250, 444000, 499500, 540000, 555000, 624375, 666000, 740000, 799200, 832500, 999000, 1110000, 1248750, 1332000, 1665000, 1998000, 2220000, 2497500, 3330000, 3996000, 4995000, 6660000, 9990000, 19980000]

約数ペア:

[(1, 19980000), (2, 9990000), (3, 6660000), (4, 4995000), (5, 3996000), (6, 3330000), (8, 2497500), (9, 2220000), (10, 1998000), (12, 1665000), (15, 1332000), (16, 1248750), (18, 1110000), (20, 999000), (24, 832500), (25, 799200), (27, 740000), (30, 666000), (32, 624375), (36, 555000), (37, 540000), (40, 499500), (45, 444000), (48, 416250), (50, 399600), (54, 370000), (60, 333000), (72, 277500), (74, 270000), (75, 266400), (80, 249750), (90, 222000), (96, 208125), (100, 199800), (108, 185000), (111, 180000), (120, 166500), (125, 159840), (135, 148000), (144, 138750), (148, 135000), (150, 133200), (160, 124875), (180, 111000), (185, 108000), (200, 99900), (216, 92500), (222, 90000), (225, 88800), (240, 83250), (250, 79920), (270, 74000), (288, 69375), (296, 67500), (300, 66600), (333, 60000), (360, 55500), (370, 54000), (375, 53280), (400, 49950), (432, 46250), (444, 45000), (450, 44400), (480, 41625), (500, 39960), (540, 37000), (555, 36000), (592, 33750), (600, 33300), (625, 31968), (666, 30000), (675, 29600), (720, 27750), (740, 27000), (750, 26640), (800, 24975), (864, 23125), (888, 22500), (900, 22200), (925, 21600), (999, 20000), (1000, 19980), (1080, 18500), (1110, 18000), (1125, 17760), (1184, 16875), (1200, 16650), (1250, 15984), (1332, 15000), (1350, 14800), (1440, 13875), (1480, 13500), (1500, 13320), (1665, 12000), (1776, 11250), (1800, 11100), (1850, 10800), (1875, 10656), (1998, 10000), (2000, 9990), (2160, 9250), (2220, 9000), (2250, 8880), (2400, 8325), (2500, 7992), (2664, 7500), (2700, 7400), (2775, 7200), (2960, 6750), (3000, 6660), (3330, 6000), (3375, 5920), (3552, 5625), (3600, 5550), (3700, 5400), (3750, 5328), (3996, 5000), (4000, 4995), (4320, 4625), (4440, 4500)]