20424427 has 2 divisors, whose sum is σ = 20424428. Its totient is φ = 20424426.

The previous prime is 20424421. The next prime is 20424431. The reversal of 20424427 is 72442402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20424427 is a prime.

It is not a weakly prime, because it can be changed into another prime (20424421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212213 + 10212214.

It is an arithmetic number, because the mean of its divisors is an integer number (10212214).

Almost surely, 2^20424427 is an apocalyptic number.

20424427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424427 is an equidigital number, since it uses as much as digits as its factorization.

20424427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 20424427 is about 4519.3392216119. The cubic root of 20424427 is about 273.3484572569.

Adding to 20424427 its reverse (72442402), we get a palindrome (92866829).

The spelling of 20424427 in words is "twenty million, four hundred twenty-four thousand, four hundred twenty-seven".