20425660771 has 2 divisors, whose sum is σ = 20425660772. Its totient is φ = 20425660770.

The previous prime is 20425660733. The next prime is 20425660793. The reversal of 20425660771 is 17706652402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20425660771 - 2⁷ = 20425660643 is a prime.

It is not a weakly prime, because it can be changed into another prime (20425660721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212830385 + 10212830386.

It is an arithmetic number, because the mean of its divisors is an integer number (10212830386).

Almost surely, 2^20425660771 is an apocalyptic number.

20425660771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425660771 is an equidigital number, since it uses as much as digits as its factorization.

20425660771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 20425660771 in words is "twenty billion, four hundred twenty-five million, six hundred sixty thousand, seven hundred seventy-one".