21021560

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{193}}^1\times {\mathrm{389}}^1$

素因数の和:600

約数の個数: 64

約数和(自身を含む): 54475200

約数和(自身を除く): 33453640

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 193, 280, 386, 389, 772, 778, 965, 1351, 1544, 1556, 1930, 1945, 2702, 2723, 3112, 3860, 3890, 5404, 5446, 6755, 7720, 7780, 10808, 10892, 13510, 13615, 15560, 21784, 27020, 27230, 54040, 54460, 75077, 108920, 150154, 300308, 375385, 525539, 600616, 750770, 1051078, 1501540, 2102156, 2627695, 3003080, 4204312, 5255390, 10510780, 21021560]

約数ペア:

[(1, 21021560), (2, 10510780), (4, 5255390), (5, 4204312), (7, 3003080), (8, 2627695), (10, 2102156), (14, 1501540), (20, 1051078), (28, 750770), (35, 600616), (40, 525539), (56, 375385), (70, 300308), (140, 150154), (193, 108920), (280, 75077), (386, 54460), (389, 54040), (772, 27230), (778, 27020), (965, 21784), (1351, 15560), (1544, 13615), (1556, 13510), (1930, 10892), (1945, 10808), (2702, 7780), (2723, 7720), (3112, 6755), (3860, 5446), (3890, 5404)]