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d() is the number of positive divisors of n, including 1 and n itself; σ() is the sum of the positive divisors of n, including 1 and n itselfs() is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n
Year 624 was a leap year ... April 20 – (27th day of the 3rd month of the 6th year of the Wu'de era) ... [15] December 21 – A group of 1,000 Muslims from Mecca, ...
It has an aliquot sum of 42; within an aliquot sequence of thirteen composite numbers (30, 42, 54, 66, 78, 90, 144, 259, 45, 33, 15, 9, 4, 3, 1, 0) to the Prime in the 3-aliquot tree. From 1 to the number 30, this is the longest Aliquot Sequence. It is also: A semiperfect number, since adding some subsets of its divisors (e.g., 5, 10 and 15 ...
12 (twelve) is the natural number following 11 and preceding 13.. Twelve is the 3rd superior highly composite number, [1] the 3rd colossally abundant number, [2] the 5th highly composite number, and is divisible by the numbers from 1 to 4, and 6, a large number of divisors comparatively.
Sha'ban is the last lunar month before Ramadan, and so Muslims determine in it when the first day of Ramadan fasting will be. In the second Hijri year (624), fasting during Ramadan was made obligatory during this month.
Subtracting 2 times the last digit from the rest gives a multiple of 3. (Works because 21 is divisible by 3) 405: 40 − 5 × 2 = 40 − 10 = 30 = 3 × 10. 4: The last two digits form a number that is divisible by 4. [2] [3] 40,832: 32 is divisible by 4. If the tens digit is even, the ones digit must be 0, 4, or 8.
Australia is a continent, a country, and a land where kangaroos outnumber people. However, according to its most active online ambassadors, the place offers much more than the famous marsupial.
It was 25 degrees and the time was 3:54 (6 to 4). Reika505nm 03:43, 27 June 2012 (UTC) i like this theory. his claim in the article that it means "25 or 26 to 4" fails on 2 counts -- ppl rarely express times around x:35 as "25 to/of"...usually those only kick in for the last 15 (sometimes 20) mins of the hour. not 25. much less 26!