20536436647 has 2 divisors, whose sum is σ = 20536436648. Its totient is φ = 20536436646.

The previous prime is 20536436549. The next prime is 20536436663. The reversal of 20536436647 is 74663463502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20536436647 - 2⁷ = 20536436519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20536436597 and 20536436606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20536439647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10268218323 + 10268218324.

It is an arithmetic number, because the mean of its divisors is an integer number (10268218324).

Almost surely, 2^20536436647 is an apocalyptic number.

20536436647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20536436647 is an equidigital number, since it uses as much as digits as its factorization.

20536436647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 46.

The spelling of 20536436647 in words is "twenty billion, five hundred thirty-six million, four hundred thirty-six thousand, six hundred forty-seven".