20936499169 has 2 divisors, whose sum is σ = 20936499170. Its totient is φ = 20936499168.

The previous prime is 20936499137. The next prime is 20936499193. The reversal of 20936499169 is 96199463902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13768675600 + 7167823569 = 117340^2 + 84663^2 .

It is a cyclic number.

It is not a de Polignac number, because 20936499169 - 2⁵ = 20936499137 is a prime.

It is a super-2 number, since 2×20936499169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20936299169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468249584 + 10468249585.

It is an arithmetic number, because the mean of its divisors is an integer number (10468249585).

Almost surely, 2^20936499169 is an apocalyptic number.

It is an amenable number.

20936499169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20936499169 is an equidigital number, since it uses as much as digits as its factorization.

20936499169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5668704, while the sum is 58.

The spelling of 20936499169 in words is "twenty billion, nine hundred thirty-six million, four hundred ninety-nine thousand, one hundred sixty-nine".