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20923 = 7361
BaseRepresentation
bin101000110111011
31001200221
411012323
51132143
6240511
7115000
oct50673
931627
1020923
11147a1
1210137
1396a6
1478a7
1562ed
hex51bb

20923 has 8 divisors (see below), whose sum is σ = 24800. Its totient is φ = 17640.

The previous prime is 20921. The next prime is 20929. The reversal of 20923 is 32902.

It is not a de Polignac number, because 20923 - 21 = 20921 is a prime.

It is a Duffinian number.

20923 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 20897 and 20906.

It is not an unprimeable number, because it can be changed into a prime (20921) 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, 313 + ... + 373.

It is an arithmetic number, because the mean of its divisors is an integer number (3100).

220923 is an apocalyptic number.

20923 is a deficient number, since it is larger than the sum of its proper divisors (3877).

20923 is an frugal number, since it uses more digits than its factorization.

20923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20923 is about 144.6478482384. The cubic root of 20923 is about 27.5554802817. Note that the first 3 decimals are identical.

It can be divided in two parts, 209 and 23, that added together give a palindrome (232).

The spelling of 20923 in words is "twenty thousand, nine hundred twenty-three".

Divisors: 1 7 49 61 343 427 2989 20923