20536436549 has 2 divisors, whose sum is σ = 20536436550. Its totient is φ = 20536436548.

The previous prime is 20536436527. The next prime is 20536436647. The reversal of 20536436549 is 94563463502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20388984100 + 147452449 = 142790^2 + 12143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20536436549 is a prime.

It is a super-2 number, since 2×20536436549² (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 (20536436519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10268218274 + 10268218275.

It is an arithmetic number, because the mean of its divisors is an integer number (10268218275).

Almost surely, 2^20536436549 is an apocalyptic number.

It is an amenable number.

20536436549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20536436549 is an equidigital number, since it uses as much as digits as its factorization.

20536436549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 20536436549 in words is "twenty billion, five hundred thirty-six million, four hundred thirty-six thousand, five hundred forty-nine".