20641935529 has 2 divisors, whose sum is σ = 20641935530. Its totient is φ = 20641935528.

The previous prime is 20641935527. The next prime is 20641935539. The reversal of 20641935529 is 92553914602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20555817129 + 86118400 = 143373^2 + 9280^2 .

It is a cyclic number.

It is not a de Polignac number, because 20641935529 - 2¹ = 20641935527 is a prime.

Together with 20641935527, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20641935527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320967764 + 10320967765.

It is an arithmetic number, because the mean of its divisors is an integer number (10320967765).

Almost surely, 2^20641935529 is an apocalyptic number.

It is an amenable number.

20641935529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641935529 is an equidigital number, since it uses as much as digits as its factorization.

20641935529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 20641935529 in words is "twenty billion, six hundred forty-one million, nine hundred thirty-five thousand, five hundred twenty-nine".