20535205247 has 2 divisors, whose sum is σ = 20535205248. Its totient is φ = 20535205246.

The previous prime is 20535205189. The next prime is 20535205277. The reversal of 20535205247 is 74250253502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20535205247 - 2¹⁶ = 20535139711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20535205277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267602623 + 10267602624.

It is an arithmetic number, because the mean of its divisors is an integer number (10267602624).

Almost surely, 2^20535205247 is an apocalyptic number.

20535205247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535205247 is an equidigital number, since it uses as much as digits as its factorization.

20535205247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 35.

Adding to 20535205247 its reverse (74250253502), we get a palindrome (94785458749).

The spelling of 20535205247 in words is "twenty billion, five hundred thirty-five million, two hundred five thousand, two hundred forty-seven".