20618077 has 2 divisors, whose sum is σ = 20618078. Its totient is φ = 20618076.

The previous prime is 20618057. The next prime is 20618083. The reversal of 20618077 is 77081602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12716356 + 7901721 = 3566^2 + 2811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20618077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20618057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10309038 + 10309039.

It is an arithmetic number, because the mean of its divisors is an integer number (10309039).

Almost surely, 2^20618077 is an apocalyptic number.

It is an amenable number.

20618077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20618077 is an equidigital number, since it uses as much as digits as its factorization.

20618077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 20618077 is about 4540.7132699610. The cubic root of 20618077 is about 274.2096402963.

Adding to 20618077 its reverse (77081602), we get a palindrome (97699679).

The spelling of 20618077 in words is "twenty million, six hundred eighteen thousand, seventy-seven".