18740440

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1823}}^1$

素因数の和:2091

約数の個数: 32

約数和(自身を含む): 42353280

約数和(自身を除く): 23612840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 1823, 2056, 2570, 3646, 5140, 7292, 9115, 10280, 14584, 18230, 36460, 72920, 468511, 937022, 1874044, 2342555, 3748088, 4685110, 9370220, 18740440]

約数ペア:

[(1, 18740440), (2, 9370220), (4, 4685110), (5, 3748088), (8, 2342555), (10, 1874044), (20, 937022), (40, 468511), (257, 72920), (514, 36460), (1028, 18230), (1285, 14584), (1823, 10280), (2056, 9115), (2570, 7292), (3646, 5140)]