State media reported on Monday, citing a study that blamed sex-specific abortions as a major factor, that more than 24 million Chinese men of marrying age could find themselves without spouses in 2020.

The study, by the government-backed Chinese Academy of Social Sciences, named the gender imbalance among newborns as the most serious demographic problem for the country's population of 1.3 billion, the Global Times said.

"Sex-specific abortions remained extremely commonplace, especially in rural areas," where the cultural preference for boys over girls is strongest, the study said, while noting the reasons for the gender imbalance were "complex."

Researcher Wang Guangzhou said the skewed birth ratio could lead to difficulties for men with lower incomes in finding spouses, as well as a widening age gap between partners, according to the Global Times.

Another researcher quoted by the newspaper, Wang Yuesheng, said men in poorer parts of China would be forced to accept marriages late in life or remain single for life, which could "cause a break in family lines."

"The chance of getting married will be rare if a man is more than 40 years old in the countryside. They will be more dependent on social security as they age and have fewer household resources to rely on," Wang said.

The study said the key contributing factors to the phenomenon included the nation's family-planning policy, which restricts the number of children citizens may have, as well as an insufficient social security system.