20201864647 has 2 divisors, whose sum is σ = 20201864648. Its totient is φ = 20201864646.

The previous prime is 20201864623. The next prime is 20201864671. The reversal of 20201864647 is 74646810202.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20201864623) and next prime (20201864671).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201864647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201864047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100932323 + 10100932324.

It is an arithmetic number, because the mean of its divisors is an integer number (10100932324).

Almost surely, 2^20201864647 is an apocalyptic number.

20201864647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201864647 is an equidigital number, since it uses as much as digits as its factorization.

20201864647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 20201864647 in words is "twenty billion, two hundred one million, eight hundred sixty-four thousand, six hundred forty-seven".