20420207 has 2 divisors, whose sum is σ = 20420208. Its totient is φ = 20420206.

The previous prime is 20420167. The next prime is 20420209. The reversal of 20420207 is 70202402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20420207 - 2¹⁰ = 20419183 is a prime.

Together with 20420209, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210103 + 10210104.

It is an arithmetic number, because the mean of its divisors is an integer number (10210104).

Almost surely, 2^20420207 is an apocalyptic number.

20420207 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420207 is an equidigital number, since it uses as much as digits as its factorization.

20420207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20420207 is about 4518.8723150804. The cubic root of 20420207 is about 273.3296299650.

Adding to 20420207 its reverse (70202402), we get a palindrome (90622609).

The spelling of 20420207 in words is "twenty million, four hundred twenty thousand, two hundred seven".