20424423 has 8 divisors (see below), whose sum is σ = 27577600. Its totient is φ = 13443768.

The previous prime is 20424421. The next prime is 20424427. The reversal of 20424423 is 32442402.

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

It is not a de Polignac number, because 20424423 - 2¹ = 20424421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20424423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424421) 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, 42853 + ... + 43326.

It is an arithmetic number, because the mean of its divisors is an integer number (3447200).

Almost surely, 2^20424423 is an apocalyptic number.

20424423 is a deficient number, since it is larger than the sum of its proper divisors (7153177).

20424423 is an equidigital number, since it uses as much as digits as its factorization.

20424423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86261.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 20424423 is about 4519.3387790693. The cubic root of 20424423 is about 273.3484394123.

Adding to 20424423 its reverse (32442402), we get a palindrome (52866825).

The spelling of 20424423 in words is "twenty million, four hundred twenty-four thousand, four hundred twenty-three".