20641920

素因数分解:

$2^7\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{827}}^1$

素因数の和:862

約数の個数: 128

約数和(自身を含む): 70943040

約数和(自身を除く): 50301120

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 20, 24, 26, 30, 32, 39, 40, 48, 52, 60, 64, 65, 78, 80, 96, 104, 120, 128, 130, 156, 160, 192, 195, 208, 240, 260, 312, 320, 384, 390, 416, 480, 520, 624, 640, 780, 827, 832, 960, 1040, 1248, 1560, 1654, 1664, 1920, 2080, 2481, 2496, 3120, 3308, 4135, 4160, 4962, 4992, 6240, 6616, 8270, 8320, 9924, 10751, 12405, 12480, 13232, 16540, 19848, 21502, 24810, 24960, 26464, 32253, 33080, 39696, 43004, 49620, 52928, 53755, 64506, 66160, 79392, 86008, 99240, 105856, 107510, 129012, 132320, 158784, 161265, 172016, 198480, 215020, 258024, 264640, 317568, 322530, 344032, 396960, 430040, 516048, 529280, 645060, 688064, 793920, 860080, 1032096, 1290120, 1376128, 1587840, 1720160, 2064192, 2580240, 3440320, 4128384, 5160480, 6880640, 10320960, 20641920]

約数ペア:

[(1, 20641920), (2, 10320960), (3, 6880640), (4, 5160480), (5, 4128384), (6, 3440320), (8, 2580240), (10, 2064192), (12, 1720160), (13, 1587840), (15, 1376128), (16, 1290120), (20, 1032096), (24, 860080), (26, 793920), (30, 688064), (32, 645060), (39, 529280), (40, 516048), (48, 430040), (52, 396960), (60, 344032), (64, 322530), (65, 317568), (78, 264640), (80, 258024), (96, 215020), (104, 198480), (120, 172016), (128, 161265), (130, 158784), (156, 132320), (160, 129012), (192, 107510), (195, 105856), (208, 99240), (240, 86008), (260, 79392), (312, 66160), (320, 64506), (384, 53755), (390, 52928), (416, 49620), (480, 43004), (520, 39696), (624, 33080), (640, 32253), (780, 26464), (827, 24960), (832, 24810), (960, 21502), (1040, 19848), (1248, 16540), (1560, 13232), (1654, 12480), (1664, 12405), (1920, 10751), (2080, 9924), (2481, 8320), (2496, 8270), (3120, 6616), (3308, 6240), (4135, 4992), (4160, 4962)]