206820077 has 2 divisors, whose sum is σ = 206820078. Its totient is φ = 206820076.

The previous prime is 206820059. The next prime is 206820101. The reversal of 206820077 is 770028602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168454441 + 38365636 = 12979^2 + 6194^2 .

It is a cyclic number.

It is not a de Polignac number, because 206820077 - 2⁶ = 206820013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206820877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103410038 + 103410039.

It is an arithmetic number, because the mean of its divisors is an integer number (103410039).

Almost surely, 2^206820077 is an apocalyptic number.

It is an amenable number.

206820077 is a deficient number, since it is larger than the sum of its proper divisors (1).

206820077 is an equidigital number, since it uses as much as digits as its factorization.

206820077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 206820077 is about 14381.2404541472. The cubic root of 206820077 is about 591.3767303996.

Adding to 206820077 its reverse (770028602), we get a palindrome (976848679).

The spelling of 206820077 in words is "two hundred six million, eight hundred twenty thousand, seventy-seven".