20531071063 has 2 divisors, whose sum is σ = 20531071064. Its totient is φ = 20531071062.

The previous prime is 20531071039. The next prime is 20531071097. The reversal of 20531071063 is 36017013502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531071063 - 2²¹ = 20528973911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531071763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265535531 + 10265535532.

It is an arithmetic number, because the mean of its divisors is an integer number (10265535532).

Almost surely, 2^20531071063 is an apocalyptic number.

20531071063 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531071063 is an equidigital number, since it uses as much as digits as its factorization.

20531071063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 28.

Adding to 20531071063 its reverse (36017013502), we get a palindrome (56548084565).

The spelling of 20531071063 in words is "twenty billion, five hundred thirty-one million, seventy-one thousand, sixty-three".