20644708603 has 2 divisors, whose sum is σ = 20644708604. Its totient is φ = 20644708602.

The previous prime is 20644708577. The next prime is 20644708619. The reversal of 20644708603 is 30680744602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20644708603 - 2¹⁷ = 20644577531 is a prime.

It is not a weakly prime, because it can be changed into another prime (20644708303) 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, 10322354301 + 10322354302.

It is an arithmetic number, because the mean of its divisors is an integer number (10322354302).

Almost surely, 2^20644708603 is an apocalyptic number.

20644708603 is a deficient number, since it is larger than the sum of its proper divisors (1).

20644708603 is an equidigital number, since it uses as much as digits as its factorization.

20644708603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 20644708603 in words is "twenty billion, six hundred forty-four million, seven hundred eight thousand, six hundred three".