20649503603 has 2 divisors, whose sum is σ = 20649503604. Its totient is φ = 20649503602.

The previous prime is 20649503597. The next prime is 20649503617. The reversal of 20649503603 is 30630594602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20649503603 - 2¹⁰ = 20649502579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20649503653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324751801 + 10324751802.

It is an arithmetic number, because the mean of its divisors is an integer number (10324751802).

Almost surely, 2^20649503603 is an apocalyptic number.

20649503603 is a deficient number, since it is larger than the sum of its proper divisors (1).

20649503603 is an equidigital number, since it uses as much as digits as its factorization.

20649503603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 38.

The spelling of 20649503603 in words is "twenty billion, six hundred forty-nine million, five hundred three thousand, six hundred three".