20516077 has 2 divisors, whose sum is σ = 20516078. Its totient is φ = 20516076.

The previous prime is 20516071. The next prime is 20516081. The reversal of 20516077 is 77061502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 8328996 = 3491^2 + 2886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20516077 - 2¹⁹ = 19991789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20516071) 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, 10258038 + 10258039.

It is an arithmetic number, because the mean of its divisors is an integer number (10258039).

Almost surely, 2^20516077 is an apocalyptic number.

It is an amenable number.

20516077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516077 is an equidigital number, since it uses as much as digits as its factorization.

20516077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 20516077 is about 4529.4676287617. The cubic root of 20516077 is about 273.7567103573.

Adding to 20516077 its reverse (77061502), we get a palindrome (97577579).

It can be divided in two parts, 2051 and 6077, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 20516077 in words is "twenty million, five hundred sixteen thousand, seventy-seven".