20645105303 has 16 divisors (see below), whose sum is σ = 22458330144. Its totient is φ = 18898790400.

The previous prime is 20645105287. The next prime is 20645105353. The reversal of 20645105303 is 30350154602.

It is a cyclic number.

It is not a de Polignac number, because 20645105303 - 2⁴ = 20645105287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645105353) 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 in 15 ways as a sum of consecutive naturals, for example, 2921951 + ... + 2929007.

It is an arithmetic number, because the mean of its divisors is an integer number (1403645634).

Almost surely, 2^20645105303 is an apocalyptic number.

20645105303 is a deficient number, since it is larger than the sum of its proper divisors (1813224841).

20645105303 is a wasteful number, since it uses less digits than its factorization.

20645105303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11762.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 20645105303 its reverse (30350154602), we get a palindrome (50995259905).

The spelling of 20645105303 in words is "twenty billion, six hundred forty-five million, one hundred five thousand, three hundred three".