20025705647 has 2 divisors, whose sum is σ = 20025705648. Its totient is φ = 20025705646.

The previous prime is 20025705599. The next prime is 20025705649. The reversal of 20025705647 is 74650752002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20025705647 - 2¹⁴ = 20025689263 is a prime.

Together with 20025705649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20025705647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20025705649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10012852823 + 10012852824.

It is an arithmetic number, because the mean of its divisors is an integer number (10012852824).

Almost surely, 2^20025705647 is an apocalyptic number.

20025705647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20025705647 is an equidigital number, since it uses as much as digits as its factorization.

20025705647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 20025705647 in words is "twenty billion, twenty-five million, seven hundred five thousand, six hundred forty-seven".