20424263 has 2 divisors, whose sum is σ = 20424264. Its totient is φ = 20424262.

The previous prime is 20424247. The next prime is 20424277. The reversal of 20424263 is 36242402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20424263 - 2⁴ = 20424247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20454263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212131 + 10212132.

It is an arithmetic number, because the mean of its divisors is an integer number (10212132).

Almost surely, 2^20424263 is an apocalyptic number.

20424263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424263 is an equidigital number, since it uses as much as digits as its factorization.

20424263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 20424263 is about 4519.3210773301. The cubic root of 20424263 is about 273.3477256286.

Adding to 20424263 its reverse (36242402), we get a palindrome (56666665).

The spelling of 20424263 in words is "twenty million, four hundred twenty-four thousand, two hundred sixty-three".