20390077 has 2 divisors, whose sum is σ = 20390078. Its totient is φ = 20390076.

The previous prime is 20390047. The next prime is 20390081. The reversal of 20390077 is 77009302.

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., 19456921 + 933156 = 4411^2 + 966^2 .

It is a cyclic number.

It is not a de Polignac number, because 20390077 - 2¹⁹ = 19865789 is a prime.

It is a super-3 number, since 3×20390077³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20390017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10195038 + 10195039.

It is an arithmetic number, because the mean of its divisors is an integer number (10195039).

Almost surely, 2^20390077 is an apocalyptic number.

It is an amenable number.

20390077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20390077 is an equidigital number, since it uses as much as digits as its factorization.

20390077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 20390077 is about 4515.5372880755. The cubic root of 20390077 is about 273.1951312382.

Adding to 20390077 its reverse (77009302), we get a palindrome (97399379).

The spelling of 20390077 in words is "twenty million, three hundred ninety thousand, seventy-seven".