20005555541 has 2 divisors, whose sum is σ = 20005555542. Its totient is φ = 20005555540.

The previous prime is 20005555529. The next prime is 20005555607. The reversal of 20005555541 is 14555550002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19436542225 + 569013316 = 139415^2 + 23854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20005555541 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20005555498 and 20005555507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20005555501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002777770 + 10002777771.

It is an arithmetic number, because the mean of its divisors is an integer number (10002777771).

Almost surely, 2^20005555541 is an apocalyptic number.

It is an amenable number.

20005555541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005555541 is an equidigital number, since it uses as much as digits as its factorization.

20005555541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25000, while the sum is 32.

The spelling of 20005555541 in words is "twenty billion, five million, five hundred fifty-five thousand, five hundred forty-one".