20020404647 has 2 divisors, whose sum is σ = 20020404648. Its totient is φ = 20020404646.

The previous prime is 20020404631. The next prime is 20020404697. The reversal of 20020404647 is 74640402002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20020404647 - 2⁴ = 20020404631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020404697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010202323 + 10010202324.

It is an arithmetic number, because the mean of its divisors is an integer number (10010202324).

Almost surely, 2^20020404647 is an apocalyptic number.

20020404647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020404647 is an equidigital number, since it uses as much as digits as its factorization.

20020404647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 29.

Adding to 20020404647 its reverse (74640402002), we get a palindrome (94660806649).

The spelling of 20020404647 in words is "twenty billion, twenty million, four hundred four thousand, six hundred forty-seven".