20710213 has 2 divisors, whose sum is σ = 20710214. Its totient is φ = 20710212.

The previous prime is 20710187. The next prime is 20710231. The reversal of 20710213 is 31201702.

It is a happy number.

Together with next prime (20710231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 487204 = 4497^2 + 698^2 .

It is a cyclic number.

It is not a de Polignac number, because 20710213 - 2⁵ = 20710181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20710273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355106 + 10355107.

It is an arithmetic number, because the mean of its divisors is an integer number (10355107).

Almost surely, 2^20710213 is an apocalyptic number.

It is an amenable number.

20710213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20710213 is an equidigital number, since it uses as much as digits as its factorization.

20710213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20710213 is about 4550.8475034877. The cubic root of 20710213 is about 274.6174869204.

Adding to 20710213 its reverse (31201702), we get a palindrome (51911915).

The spelling of 20710213 in words is "twenty million, seven hundred ten thousand, two hundred thirteen".