20424199 has 2 divisors, whose sum is σ = 20424200. Its totient is φ = 20424198.

The previous prime is 20424197. The next prime is 20424247. The reversal of 20424199 is 99142402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20424199 - 2¹ = 20424197 is a prime.

Together with 20424197, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20424199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212099 + 10212100.

It is an arithmetic number, because the mean of its divisors is an integer number (10212100).

Almost surely, 2^20424199 is an apocalyptic number.

20424199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424199 is an equidigital number, since it uses as much as digits as its factorization.

20424199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20424199 is about 4519.3139966150. The cubic root of 20424199 is about 273.3474401140.

It can be divided in two parts, 2042 and 4199, that added together give a square (6241 = 79²).

The spelling of 20424199 in words is "twenty million, four hundred twenty-four thousand, one hundred ninety-nine".