20530523437 has 2 divisors, whose sum is σ = 20530523438. Its totient is φ = 20530523436.

The previous prime is 20530523423. The next prime is 20530523561. The reversal of 20530523437 is 73432503502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13519643076 + 7010880361 = 116274^2 + 83731^2 .

It is a cyclic number.

It is not a de Polignac number, because 20530523437 - 2³¹ = 18383039789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20530523737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265261718 + 10265261719.

It is an arithmetic number, because the mean of its divisors is an integer number (10265261719).

Almost surely, 2^20530523437 is an apocalyptic number.

It is an amenable number.

20530523437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530523437 is an equidigital number, since it uses as much as digits as its factorization.

20530523437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 34.

The spelling of 20530523437 in words is "twenty billion, five hundred thirty million, five hundred twenty-three thousand, four hundred thirty-seven".