20545623863 has 2 divisors, whose sum is σ = 20545623864. Its totient is φ = 20545623862.

The previous prime is 20545623841. The next prime is 20545623869. The reversal of 20545623863 is 36832654502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20545623863 - 2¹² = 20545619767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20545623869) 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, 10272811931 + 10272811932.

It is an arithmetic number, because the mean of its divisors is an integer number (10272811932).

Almost surely, 2^20545623863 is an apocalyptic number.

20545623863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545623863 is an equidigital number, since it uses as much as digits as its factorization.

20545623863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 20545623863 in words is "twenty billion, five hundred forty-five million, six hundred twenty-three thousand, eight hundred sixty-three".