20205077 has 2 divisors, whose sum is σ = 20205078. Its totient is φ = 20205076.

The previous prime is 20205041. The next prime is 20205103. The reversal of 20205077 is 77050202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13476241 + 6728836 = 3671^2 + 2594^2 .

It is a cyclic number.

It is not a de Polignac number, because 20205077 - 2²² = 16010773 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 (20205377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102538 + 10102539.

It is an arithmetic number, because the mean of its divisors is an integer number (10102539).

Almost surely, 2^20205077 is an apocalyptic number.

It is an amenable number.

20205077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205077 is an equidigital number, since it uses as much as digits as its factorization.

20205077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 20205077 is about 4495.0057842010. The cubic root of 20205077 is about 272.3663828841.

Adding to 20205077 its reverse (77050202), we get a palindrome (97255279).

The spelling of 20205077 in words is "twenty million, two hundred five thousand, seventy-seven".