21785540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{2551}}^1$

素因数の和:2628

約数の個数: 48

約数和(自身を含む): 53163264

約数和(自身を除く): 31377724

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 61, 70, 122, 140, 244, 305, 427, 610, 854, 1220, 1708, 2135, 2551, 4270, 5102, 8540, 10204, 12755, 17857, 25510, 35714, 51020, 71428, 89285, 155611, 178570, 311222, 357140, 622444, 778055, 1089277, 1556110, 2178554, 3112220, 4357108, 5446385, 10892770, 21785540]

約数ペア:

[(1, 21785540), (2, 10892770), (4, 5446385), (5, 4357108), (7, 3112220), (10, 2178554), (14, 1556110), (20, 1089277), (28, 778055), (35, 622444), (61, 357140), (70, 311222), (122, 178570), (140, 155611), (244, 89285), (305, 71428), (427, 51020), (610, 35714), (854, 25510), (1220, 17857), (1708, 12755), (2135, 10204), (2551, 8540), (4270, 5102)]