20351644063603 has 4 divisors (see below), whose sum is σ = 21008148710848. Its totient is φ = 19695139416360.

The previous prime is 20351644063573. The next prime is 20351644063627. The reversal of 20351644063603 is 30636044615302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20351644063603 - 2⁵ = 20351644063571 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20351644063603.

It is not an unprimeable number, because it can be changed into a prime (20351644064603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328252323576 + ... + 328252323637.

It is an arithmetic number, because the mean of its divisors is an integer number (5252037177712).

Almost surely, 2^{20351644063603} is an apocalyptic number.

20351644063603 is a deficient number, since it is larger than the sum of its proper divisors (656504647245).

20351644063603 is an equidigital number, since it uses as much as digits as its factorization.

20351644063603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656504647244.

The product of its (nonzero) digits is 933120, while the sum is 43.

Adding to 20351644063603 its reverse (30636044615302), we get a palindrome (50987688678905).

The spelling of 20351644063603 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-four million, sixty-three thousand, six hundred three".