20826713729 has 2 divisors, whose sum is σ = 20826713730. Its totient is φ = 20826713728.

The previous prime is 20826713681. The next prime is 20826713737. The reversal of 20826713729 is 92731762802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20807485504 + 19228225 = 144248^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826713729 - 2⁸ = 20826713473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20826713429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10413356864 + 10413356865.

It is an arithmetic number, because the mean of its divisors is an integer number (10413356865).

Almost surely, 2^20826713729 is an apocalyptic number.

It is an amenable number.

20826713729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826713729 is an equidigital number, since it uses as much as digits as its factorization.

20826713729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 20826713729 in words is "twenty billion, eight hundred twenty-six million, seven hundred thirteen thousand, seven hundred twenty-nine".