19980800

素因数分解:

$2^9\times 5^2\times 7^1\times {\mathrm{223}}^1$

素因数の和:258

約数の個数: 120

約数和(自身を含む): 56829696

約数和(自身を除く): 36848896

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 32, 35, 40, 50, 56, 64, 70, 80, 100, 112, 128, 140, 160, 175, 200, 223, 224, 256, 280, 320, 350, 400, 446, 448, 512, 560, 640, 700, 800, 892, 896, 1115, 1120, 1280, 1400, 1561, 1600, 1784, 1792, 2230, 2240, 2560, 2800, 3122, 3200, 3568, 3584, 4460, 4480, 5575, 5600, 6244, 6400, 7136, 7805, 8920, 8960, 11150, 11200, 12488, 12800, 14272, 15610, 17840, 17920, 22300, 22400, 24976, 28544, 31220, 35680, 39025, 44600, 44800, 49952, 57088, 62440, 71360, 78050, 89200, 89600, 99904, 114176, 124880, 142720, 156100, 178400, 199808, 249760, 285440, 312200, 356800, 399616, 499520, 570880, 624400, 713600, 799232, 999040, 1248800, 1427200, 1998080, 2497600, 2854400, 3996160, 4995200, 9990400, 19980800]

約数ペア:

[(1, 19980800), (2, 9990400), (4, 4995200), (5, 3996160), (7, 2854400), (8, 2497600), (10, 1998080), (14, 1427200), (16, 1248800), (20, 999040), (25, 799232), (28, 713600), (32, 624400), (35, 570880), (40, 499520), (50, 399616), (56, 356800), (64, 312200), (70, 285440), (80, 249760), (100, 199808), (112, 178400), (128, 156100), (140, 142720), (160, 124880), (175, 114176), (200, 99904), (223, 89600), (224, 89200), (256, 78050), (280, 71360), (320, 62440), (350, 57088), (400, 49952), (446, 44800), (448, 44600), (512, 39025), (560, 35680), (640, 31220), (700, 28544), (800, 24976), (892, 22400), (896, 22300), (1115, 17920), (1120, 17840), (1280, 15610), (1400, 14272), (1561, 12800), (1600, 12488), (1784, 11200), (1792, 11150), (2230, 8960), (2240, 8920), (2560, 7805), (2800, 7136), (3122, 6400), (3200, 6244), (3568, 5600), (3584, 5575), (4460, 4480)]