22 (number)

22 (twenty-two) is the natural number following 21 and preceding 23.

In mathematics

Twenty-two is an even composite number, its proper divisors being 1, 2 and 11. 22 is the sixth discrete semiprime and the fourth in the (2 × q) family. With 21 it forms the second discrete semiprime pair. 22 has an aliquot sum of 14 and is the fifth composite number found in the 7-aliquot tree. It has a 7-member aliquot sequence 22, 14, 10, 8, 7, 1, 0 of which the next two members are themselves discrete semiprimes, 22 is the first discrete semiprime exhibiting this property. 169 also has 14 as its aliquot sum. 22 is itself the aliquot sum of two numbers 20, 38.

Twenty-two is a pentagonal number and a centered heptagonal number. When cutting a circle with just six line segments, the maximum number of pieces that can be so created is 22, thus 22 is a central polygonal number (see lazy caterer's sequence).

The sum of the totient function for the first eight integers is 22. 22 is a Perrin number, preceded in the sequence by 10, 12, 17.

Nawaz Sharif

Mian Muhammad Nawaz Sharif (Urdu: میاں محمد نواز شریف‎, pronounced [nəˈʋaːz ʃəˈriːf]; born 25 December 1949) the 18th and current Prime Minister of Pakistan in office since June 2013. A veteran politician and industrialist, he previously served as Prime Minister from November 1990 to July 1993 and from February 1997 to October 1999. Sharif is the president of Pakistan Muslim League, which is currently Pakistan's largest political party, and has formed the government. As the owner of Ittefaq Group, a leading business conglomerate, he is also one of the country's wealthiest people. He is commonly known as the "Lion of the Punjab".

Nawaz Sharif entered politics in the 1980s when in the general elections of 1985, he won with an overwhelming majority, both in the National and Provincial Assemblies. On 9 April 1985, he was sworn-in as Chief Minister of Punjab. On 31 May 1988, he was appointed caretaker Chief Minister, after the dismissal of Assemblies by General Zia. Nawaz Sharif was again elected as Chief Minister after the 1988 general elections. After Zia's death and Benazir Bhutto's being elected Prime Minister in 1988, Sharif emerged as opposition leader from the conservative Pakistan Muslim League. When Bhutto was dismissed by President Ghulam Ishaq Khan in 1990 on corruption charges, Sharif was elected Prime Minister the same year. But relations between Sharif and Ghulam Ishaq too deteriorated, with Ghulam Ishaq attempting to dismiss Sharif on similar charges. Sharif successfully challenged the President's decision in the Supreme Court, but both men were ultimately persuaded to step down in 1993 by army chief Abdul Waheed Kakar.