20769776213 has 2 divisors, whose sum is σ = 20769776214. Its totient is φ = 20769776212.

The previous prime is 20769776201. The next prime is 20769776219. The reversal of 20769776213 is 31267796702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17109163204 + 3660613009 = 130802^2 + 60503^2 .

It is a cyclic number.

It is not a de Polignac number, because 20769776213 - 2¹⁸ = 20769514069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20769776219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10384888106 + 10384888107.

It is an arithmetic number, because the mean of its divisors is an integer number (10384888107).

Almost surely, 2^20769776213 is an apocalyptic number.

It is an amenable number.

20769776213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20769776213 is an equidigital number, since it uses as much as digits as its factorization.

20769776213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 50.

The spelling of 20769776213 in words is "twenty billion, seven hundred sixty-nine million, seven hundred seventy-six thousand, two hundred thirteen".