### About the Number 20,000 (twenty thousand)

The DJIA hit 20,000 on 25 January 2017. It took 6525 days (i.e. 17 years, 10 months, 9 days) for the DJIA to double from 10,000 to 20,000.

```MathBabbler Number Analyst (MBNA) output:
=========================================
20000 is natural, counting, whole, integer
20000 is even (not odd)
20000 proper divisors are: 1,2,4,5,8,10,16,20,25,32,40,50,80,100,
125,160,200,250,400,500,625,800,1000,1250,
2000,2500,4000,5000,10000,
20000 has 29 proper divisors
20000 is abundant (sum of divisors is 29203; ratio: 1.46015)
20000 is unhappy
20000 is not a Squarefree Number: 4,16,25,100,400,625,2500,10000,
20000 is Harshad (Niven) number
20000 is composite (not prime)
20000 has the prime factors: 2*2*2*2*2*5*5*5*5 (sum=30)
20000 is a 5-smooth number
20000 is the sum of 3 distinct cubes (10^3 + 15^3 + 25^3)
20000 is *not* arithmetic (A003601)
20000 is powerful (50^2*2^3)
20000 in octal is 047040
20000 in hexadecimal is 0x4e20
20000 in binary is 100111000100000 (is odious)
20000 nearest square numbers: -119...164 (19881...20164 [142])
sqrt(20000) = 141.421
ln(20000) = 9.90349
log(20000) = 4.30103
20000 is an apocalyptic power (2^20000 contains 666)
20000! is inf
20000 is 6366.2 Pi years
20000 is 1000 scoreyears
20000 is 5001^2 - 4999^2 and 2 * (5001 + 4999)
20000 is a multiple of 2 & it contains a 2 (A121022)
20000 is a multiple of 20 & it contains a 20 (A121040)
20000 is a multiple of 200 & it contains a 200
20000 is a multiple of 2000 & it contains a 2000
20000 reciprocal is 0.00005
```

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 25 January 2017