Search a number
-
+
20999 = 112383
BaseRepresentation
bin101001000000111
31001210202
411020013
51132444
6241115
7115136
oct51007
931722
1020999
1114860
121019b
139734
14791d
15634e
hex5207

20999 has 8 divisors (see below), whose sum is σ = 24192. Its totient is φ = 18040.

The previous prime is 20983. The next prime is 21001. The reversal of 20999 is 99902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20999 - 24 = 20983 is a prime.

It is a Duffinian number.

20999 is a modest number, since divided by 999 gives 20 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212 + ... + 294.

It is an arithmetic number, because the mean of its divisors is an integer number (3024).

220999 is an apocalyptic number.

20999 is a deficient number, since it is larger than the sum of its proper divisors (3193).

20999 is a wasteful number, since it uses less digits than its factorization.

20999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 20999 is about 144.9103170930. The cubic root of 20999 is about 27.5888038324.

The spelling of 20999 in words is "twenty thousand, nine hundred ninety-nine".

Divisors: 1 11 23 83 253 913 1909 20999