20940077 has 2 divisors, whose sum is σ = 20940078. Its totient is φ = 20940076.

The previous prime is 20940067. The next prime is 20940079. The reversal of 20940077 is 77004902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16883881 + 4056196 = 4109^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20940077 - 2⁴ = 20940061 is a prime.

Together with 20940079, 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 (20940079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10470038 + 10470039.

It is an arithmetic number, because the mean of its divisors is an integer number (10470039).

Almost surely, 2^20940077 is an apocalyptic number.

It is an amenable number.

20940077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20940077 is an equidigital number, since it uses as much as digits as its factorization.

20940077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 20940077 is about 4576.0328888678. The cubic root of 20940077 is about 275.6297501594.

Adding to 20940077 its reverse (77004902), we get a palindrome (97944979).

The spelling of 20940077 in words is "twenty million, nine hundred forty thousand, seventy-seven".