20434 has 8 divisors (see below), whose sum is σ = 32508. Its totient is φ = 9600.

The previous prime is 20431. The next prime is 20441. The reversal of 20434 is 43402.

It can be written as a sum of positive squares in 2 ways, for example, as 18225 + 2209 = 135^2 + 47^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20431) 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, 267 + ... + 334.

2²⁰⁴³⁴ is an apocalyptic number.

20434 is a deficient number, since it is larger than the sum of its proper divisors (12074).

20434 is a wasteful number, since it uses less digits than its factorization.

20434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20434 is about 142.9475428260. The cubic root of 20434 is about 27.3391157044.

Adding to 20434 its reverse (43402), we get a palindrome (63836).

It can be divided in two parts, 20 and 434, that added together give a palindrome (454).

The spelling of 20434 in words is "twenty thousand, four hundred thirty-four".