20635560541 has 2 divisors, whose sum is σ = 20635560542. Its totient is φ = 20635560540.

The previous prime is 20635560529. The next prime is 20635560571. The reversal of 20635560541 is 14506553602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13281640516 + 7353920025 = 115246^2 + 85755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20635560541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20635560541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20635560511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317780270 + 10317780271.

It is an arithmetic number, because the mean of its divisors is an integer number (10317780271).

Almost surely, 2^20635560541 is an apocalyptic number.

It is an amenable number.

20635560541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20635560541 is an equidigital number, since it uses as much as digits as its factorization.

20635560541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 20635560541 in words is "twenty billion, six hundred thirty-five million, five hundred sixty thousand, five hundred forty-one".