20826806417 has 2 divisors, whose sum is σ = 20826806418. Its totient is φ = 20826806416.

The previous prime is 20826806389. The next prime is 20826806447. The reversal of 20826806417 is 71460862802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19477272721 + 1349533696 = 139561^2 + 36736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20826806417 - 2²² = 20822612113 is a prime.

It is not a weakly prime, because it can be changed into another prime (20826806447) 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, 10413403208 + 10413403209.

It is an arithmetic number, because the mean of its divisors is an integer number (10413403209).

Almost surely, 2^20826806417 is an apocalyptic number.

It is an amenable number.

20826806417 is a deficient number, since it is larger than the sum of its proper divisors (1).

20826806417 is an equidigital number, since it uses as much as digits as its factorization.

20826806417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 20826806417 in words is "twenty billion, eight hundred twenty-six million, eight hundred six thousand, four hundred seventeen".