20808560

素因数分解:

$2^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{263}}^1$

素因数の和:342

約数の個数: 80

約数和(自身を含む): 51853824

約数和(自身を除く): 31045264

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 43, 46, 80, 86, 92, 115, 172, 184, 215, 230, 263, 344, 368, 430, 460, 526, 688, 860, 920, 989, 1052, 1315, 1720, 1840, 1978, 2104, 2630, 3440, 3956, 4208, 4945, 5260, 6049, 7912, 9890, 10520, 11309, 12098, 15824, 19780, 21040, 22618, 24196, 30245, 39560, 45236, 48392, 56545, 60490, 79120, 90472, 96784, 113090, 120980, 180944, 226180, 241960, 260107, 452360, 483920, 520214, 904720, 1040428, 1300535, 2080856, 2601070, 4161712, 5202140, 10404280, 20808560]

約数ペア:

[(1, 20808560), (2, 10404280), (4, 5202140), (5, 4161712), (8, 2601070), (10, 2080856), (16, 1300535), (20, 1040428), (23, 904720), (40, 520214), (43, 483920), (46, 452360), (80, 260107), (86, 241960), (92, 226180), (115, 180944), (172, 120980), (184, 113090), (215, 96784), (230, 90472), (263, 79120), (344, 60490), (368, 56545), (430, 48392), (460, 45236), (526, 39560), (688, 30245), (860, 24196), (920, 22618), (989, 21040), (1052, 19780), (1315, 15824), (1720, 12098), (1840, 11309), (1978, 10520), (2104, 9890), (2630, 7912), (3440, 6049), (3956, 5260), (4208, 4945)]