20836829861 has 2 divisors, whose sum is σ = 20836829862. Its totient is φ = 20836829860.

The previous prime is 20836829833. The next prime is 20836829899. The reversal of 20836829861 is 16892863802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17627607361 + 3209222500 = 132769^2 + 56650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20836829861 is a prime.

It is a super-2 number, since 2×20836829861² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20836829821) 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, 10418414930 + 10418414931.

It is an arithmetic number, because the mean of its divisors is an integer number (10418414931).

Almost surely, 2^20836829861 is an apocalyptic number.

It is an amenable number.

20836829861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20836829861 is an equidigital number, since it uses as much as digits as its factorization.

20836829861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 20836829861 in words is "twenty billion, eight hundred thirty-six million, eight hundred twenty-nine thousand, eight hundred sixty-one".