20520340063 has 2 divisors, whose sum is σ = 20520340064. Its totient is φ = 20520340062.

The previous prime is 20520340019. The next prime is 20520340069. The reversal of 20520340063 is 36004302502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20520340063 - 2⁹ = 20520339551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20520340069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260170031 + 10260170032.

It is an arithmetic number, because the mean of its divisors is an integer number (10260170032).

Almost surely, 2^20520340063 is an apocalyptic number.

20520340063 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520340063 is an equidigital number, since it uses as much as digits as its factorization.

20520340063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 20520340063 its reverse (36004302502), we get a palindrome (56524642565).

The spelling of 20520340063 in words is "twenty billion, five hundred twenty million, three hundred forty thousand, sixty-three".