20530345487 has 2 divisors, whose sum is σ = 20530345488. Its totient is φ = 20530345486.

The previous prime is 20530345421. The next prime is 20530345499. The reversal of 20530345487 is 78454303502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20530345487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20533345487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265172743 + 10265172744.

It is an arithmetic number, because the mean of its divisors is an integer number (10265172744).

Almost surely, 2^20530345487 is an apocalyptic number.

20530345487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530345487 is an equidigital number, since it uses as much as digits as its factorization.

20530345487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 41.

Adding to 20530345487 its reverse (78454303502), we get a palindrome (98984648989).

The spelling of 20530345487 in words is "twenty billion, five hundred thirty million, three hundred forty-five thousand, four hundred eighty-seven".