20499893563 has 2 divisors, whose sum is σ = 20499893564. Its totient is φ = 20499893562.

The previous prime is 20499893521. The next prime is 20499893593. The reversal of 20499893563 is 36539899402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20499893563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20499893498 and 20499893507.

It is not a weakly prime, because it can be changed into another prime (20499893593) 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, 10249946781 + 10249946782.

It is an arithmetic number, because the mean of its divisors is an integer number (10249946782).

Almost surely, 2^20499893563 is an apocalyptic number.

20499893563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20499893563 is an equidigital number, since it uses as much as digits as its factorization.

20499893563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12597120, while the sum is 58.

The spelling of 20499893563 in words is "twenty billion, four hundred ninety-nine million, eight hundred ninety-three thousand, five hundred sixty-three".