Title: OPEC
Content:  As of January 2020, OPEC has 13 member countries: five in the Middle East (Western Asia), seven in Africa, and one in South America. According to the U.S. Energy Information Administration (EIA), OPEC's combined rate of oil production (including gas condensate) represented 44% of the world's total in 2016, and OPEC accounted for 81.5% of the world's "proven" oil reserves. Approval of a new member country requires agreement by three-quarters of OPEC's existing members, including all five of the founders. In October 2015, Sudan formally submitted an application to join, but it is not yet a member.
Title: Organization of Arab Petroleum Exporting Countries
Content: Algeria ; Bahrain ; Egypt ; Iraq ; Kuwait ; Libya ; Qatar ; Saudi Arabia ; Syria ; United Arab Emirates ; Tunisia As of December 2020, OAPEC has 11 members countries, 6 of which are also OPEC members:
Title: Megacorpstate
Content:  OPEC is a mnemonic for Organization of the Petroleum Exporting Countries. It was established in September 1960 in Baghdad by five founder nations, Iran, Iraq, Venezuela, Saudi Arabia and Kuwait. The initiative was taken to promote economic enrichment and stability among its member nations and to decrease the oil market volatility. As of May 2017, the organization consists of 14 countries which earn the majority of their income through oil revenues: Algeria, Angola, Ecuador, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia (the dominant exporter), United Arab Emirates, Venezuela. According to OPEC, membership is open to any nation that has substantial oil resource and observes the same principles as the organization, subject to approval by the member governments.
Title: OPEC
Content:  OPEC countries + Russia
Title: Peak oil
Content:   OPEC is an alliance among 14 diverse oil-producing countries (as of January 2019: Algeria, Angola, Ecuador, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, Republic of the Congo, Saudi Arabia, United Arab Emirates, Venezuela) to manage the supply of oil. OPEC's power was consolidated in the 1960s and 1970s as various countries nationalized their oil holdings, and wrested decision-making away from the "Seven Sisters" (Anglo-Iranian, Socony, Royal Dutch Shell, Gulf, Esso, Texaco, Socal), and created their own oil companies to control the oil. OPEC often tries to influence prices by restricting production. It does this by allocating each member country a quota for production. Members agree to keep prices high by producing at lower levels than they otherwise would. There is no way to enforce 
Title: OPEC
Content:  A number of non-OPEC member countries also participate in the organisation's initiatives such as voluntary supply cuts in order to further bind policy objectives between OPEC and non-OPEC members. This loose grouping of countries includes: Azerbaijan, Bahrain, Brunei, Kazakhstan, Malaysia, Mexico, Oman, Russia, Sudan and South Sudan.
Title: OPEC Fund for International Development
Content:  The OPEC Fund has 12 member countries: Algeria, Ecuador, Gabon, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Saudi Arabia, United Arab Emirates and Venezuela. Ecuador reactivated its membership in June 2014 after a 22-year absence. Qatar terminated its membership on 1 January 2019.
Title: OPEC
Content:  Eastern members originally called for OPEC headquarters to be in Baghdad or Beirut, but Venezuela argued for a neutral location, and so the organization chose Geneva, Switzerland. On 1 September 1965, OPEC moved to Vienna, Austria, after Switzerland declined to extend diplomatic privileges. During 1961–1975, the five founding nations were joined by Qatar (1961), Indonesia (1962–2008, rejoined 2014–2016), Libya (1962), United Arab Emirates (originally just the Emirate of Abu Dhabi, 1967), Algeria (1969), Nigeria (1971), Ecuador (1973–1992, 2007–2020), and Gabon (1975–1994, rejoined 2016). By the early 1970s, OPEC's membership accounted for more than half of worldwide oil production. Indicating that OPEC is 
Title: OPEC
Content:  The Organization of the Petroleum Exporting Countries (OPEC, ) is an intergovernmental organization or cartel of  countries. Founded on 14 September 1960 in Baghdad by the first five members (Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela), it has since 1965 been headquartered in Vienna, Austria, although Austria is not an OPEC member state. , the 13 member countries accounted for an estimated 44 percent of global oil production and 81.5 percent of the world's "proven" oil reserves, giving OPEC a major influence on global oil prices that were previously determined by the so-called "Seven Sisters" grouping of multinational oil companies. The stated mission of the organization is to "coordinate and unify the petroleum policies of its member countries and ensure the stabilization of 
Title: OPEC
Content:  Since the 1980s, representatives from Egypt, Mexico, Norway, Oman, Russia, and other oil-exporting nations have attended many OPEC meetings as observers. This arrangement serves as an informal mechanism for coordinating policies.

Question: how many countries are a part of opec?
Answer: 14.