20544563671 has 2 divisors, whose sum is σ = 20544563672. Its totient is φ = 20544563670.

The previous prime is 20544563623. The next prime is 20544563687. The reversal of 20544563671 is 17636544502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20544563671 - 2²³ = 20536175063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20544561671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272281835 + 10272281836.

It is an arithmetic number, because the mean of its divisors is an integer number (10272281836).

Almost surely, 2^20544563671 is an apocalyptic number.

20544563671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20544563671 is an equidigital number, since it uses as much as digits as its factorization.

20544563671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 20544563671 in words is "twenty billion, five hundred forty-four million, five hundred sixty-three thousand, six hundred seventy-one".