20700077 has 2 divisors, whose sum is σ = 20700078. Its totient is φ = 20700076.

The previous prime is 20700073. The next prime is 20700079. The reversal of 20700077 is 77000702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15952036 + 4748041 = 3994^2 + 2179^2 .

It is a cyclic number.

It is not a de Polignac number, because 20700077 - 2² = 20700073 is a prime.

Together with 20700079, 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 (20700073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10350038 + 10350039.

It is an arithmetic number, because the mean of its divisors is an integer number (10350039).

Almost surely, 2^20700077 is an apocalyptic number.

It is an amenable number.

20700077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20700077 is an equidigital number, since it uses as much as digits as its factorization.

20700077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 686, while the sum is 23.

The square root of 20700077 is about 4549.7337284725. The cubic root of 20700077 is about 274.5726784793.

Adding to 20700077 its reverse (77000702), we get a palindrome (97700779).

The spelling of 20700077 in words is "twenty million, seven hundred thousand, seventy-seven".