20535584647 has 2 divisors, whose sum is σ = 20535584648. Its totient is φ = 20535584646.

The previous prime is 20535584609. The next prime is 20535584701. The reversal of 20535584647 is 74648553502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20535584647 is a prime.

It is a super-2 number, since 2×20535584647² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20535584647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20535984647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267792323 + 10267792324.

It is an arithmetic number, because the mean of its divisors is an integer number (10267792324).

Almost surely, 2^20535584647 is an apocalyptic number.

20535584647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535584647 is an equidigital number, since it uses as much as digits as its factorization.

20535584647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032000, while the sum is 49.

The spelling of 20535584647 in words is "twenty billion, five hundred thirty-five million, five hundred eighty-four thousand, six hundred forty-seven".