20802488428063 has 4 divisors (see below), whose sum is σ = 20802498931440. Its totient is φ = 20802477924688.

The previous prime is 20802488428013. The next prime is 20802488428067. The reversal of 20802488428063 is 36082488420802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20802488428063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20802488427995 and 20802488428013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802488428067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279270 + ... + 6575827.

It is an arithmetic number, because the mean of its divisors is an integer number (5200624732860).

Almost surely, 2^{20802488428063} is an apocalyptic number.

20802488428063 is a deficient number, since it is larger than the sum of its proper divisors (10503377).

20802488428063 is an equidigital number, since it uses as much as digits as its factorization.

20802488428063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10503376.

The product of its (nonzero) digits is 9437184, while the sum is 55.

The spelling of 20802488428063 in words is "twenty trillion, eight hundred two billion, four hundred eighty-eight million, four hundred twenty-eight thousand, sixty-three".