20530042541 has 2 divisors, whose sum is σ = 20530042542. Its totient is φ = 20530042540.

The previous prime is 20530042523. The next prime is 20530042543. The reversal of 20530042541 is 14524003502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15523914025 + 5006128516 = 124595^2 + 70754^2 .

It is a cyclic number.

It is not a de Polignac number, because 20530042541 - 2¹⁴ = 20530026157 is a prime.

It is a Sophie Germain prime.

Together with 20530042543, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20530042541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20530042543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265021270 + 10265021271.

It is an arithmetic number, because the mean of its divisors is an integer number (10265021271).

Almost surely, 2^20530042541 is an apocalyptic number.

It is an amenable number.

20530042541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530042541 is an equidigital number, since it uses as much as digits as its factorization.

20530042541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 26.

The spelling of 20530042541 in words is "twenty billion, five hundred thirty million, forty-two thousand, five hundred forty-one".