20624640563 has 2 divisors, whose sum is σ = 20624640564. Its totient is φ = 20624640562.

The previous prime is 20624640557. The next prime is 20624640577. The reversal of 20624640563 is 36504642602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20624640563 - 2²⁰ = 20623591987 is a prime.

It is not a weakly prime, because it can be changed into another prime (20624640503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10312320281 + 10312320282.

It is an arithmetic number, because the mean of its divisors is an integer number (10312320282).

Almost surely, 2^20624640563 is an apocalyptic number.

20624640563 is a deficient number, since it is larger than the sum of its proper divisors (1).

20624640563 is an equidigital number, since it uses as much as digits as its factorization.

20624640563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 20624640563 in words is "twenty billion, six hundred twenty-four million, six hundred forty thousand, five hundred sixty-three".