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20423 = 131571
BaseRepresentation
bin100111111000111
31001000102
410333013
51123143
6234315
7113354
oct47707
931012
1020423
1114387
12b99b
1393b0
14762b
1560b8
hex4fc7

20423 has 4 divisors (see below), whose sum is σ = 22008. Its totient is φ = 18840.

The previous prime is 20411. The next prime is 20431. The reversal of 20423 is 32402.

20423 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20423 - 24 = 20407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20423.

It is not an unprimeable number, because it can be changed into a prime (20443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773 + ... + 798.

It is an arithmetic number, because the mean of its divisors is an integer number (5502).

220423 is an apocalyptic number.

20423 is a deficient number, since it is larger than the sum of its proper divisors (1585).

20423 is a wasteful number, since it uses less digits than its factorization.

20423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584.

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 20423 is about 142.9090619940. The cubic root of 20423 is about 27.3342091067.

Adding to 20423 its reverse (32402), we get a palindrome (52825).

The spelling of 20423 in words is "twenty thousand, four hundred twenty-three", and thus it is an iban number.

Divisors: 1 13 1571 20423