20640256

素因数分解:

$2^9\times 7^1\times {\mathrm{13}}^1\times {\mathrm{443}}^1$

素因数の和:481

約数の個数: 80

約数和(自身を含む): 50871744

約数和(自身を除く): 30231488

約数列:

[1, 2, 4, 7, 8, 13, 14, 16, 26, 28, 32, 52, 56, 64, 91, 104, 112, 128, 182, 208, 224, 256, 364, 416, 443, 448, 512, 728, 832, 886, 896, 1456, 1664, 1772, 1792, 2912, 3101, 3328, 3544, 3584, 5759, 5824, 6202, 6656, 7088, 11518, 11648, 12404, 14176, 23036, 23296, 24808, 28352, 40313, 46072, 46592, 49616, 56704, 80626, 92144, 99232, 113408, 161252, 184288, 198464, 226816, 322504, 368576, 396928, 645008, 737152, 793856, 1290016, 1474304, 1587712, 2580032, 2948608, 5160064, 10320128, 20640256]

約数ペア:

[(1, 20640256), (2, 10320128), (4, 5160064), (7, 2948608), (8, 2580032), (13, 1587712), (14, 1474304), (16, 1290016), (26, 793856), (28, 737152), (32, 645008), (52, 396928), (56, 368576), (64, 322504), (91, 226816), (104, 198464), (112, 184288), (128, 161252), (182, 113408), (208, 99232), (224, 92144), (256, 80626), (364, 56704), (416, 49616), (443, 46592), (448, 46072), (512, 40313), (728, 28352), (832, 24808), (886, 23296), (896, 23036), (1456, 14176), (1664, 12404), (1772, 11648), (1792, 11518), (2912, 7088), (3101, 6656), (3328, 6202), (3544, 5824), (3584, 5759)]