20635560623 has 2 divisors, whose sum is σ = 20635560624. Its totient is φ = 20635560622.

The previous prime is 20635560611. The next prime is 20635560677. The reversal of 20635560623 is 32606553602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20635560623 - 2⁸ = 20635560367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20635560523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317780311 + 10317780312.

It is an arithmetic number, because the mean of its divisors is an integer number (10317780312).

Almost surely, 2^20635560623 is an apocalyptic number.

20635560623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20635560623 is an equidigital number, since it uses as much as digits as its factorization.

20635560623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 38.

The spelling of 20635560623 in words is "twenty billion, six hundred thirty-five million, five hundred sixty thousand, six hundred twenty-three".