20776638959 has 2 divisors, whose sum is σ = 20776638960. Its totient is φ = 20776638958.

The previous prime is 20776638919. The next prime is 20776639007. The reversal of 20776638959 is 95983667702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20776638959 - 2²⁴ = 20759861743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20776638919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10388319479 + 10388319480.

It is an arithmetic number, because the mean of its divisors is an integer number (10388319480).

Almost surely, 2^20776638959 is an apocalyptic number.

20776638959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20776638959 is an equidigital number, since it uses as much as digits as its factorization.

20776638959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34292160, while the sum is 62.

The spelling of 20776638959 in words is "twenty billion, seven hundred seventy-six million, six hundred thirty-eight thousand, nine hundred fifty-nine".