20443526497 has 2 divisors, whose sum is σ = 20443526498. Its totient is φ = 20443526496.

The previous prime is 20443526489. The next prime is 20443526527. The reversal of 20443526497 is 79462534402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10265945041 + 10177581456 = 101321^2 + 100884^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443526497 - 2³ = 20443526489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20443526297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221763248 + 10221763249.

It is an arithmetic number, because the mean of its divisors is an integer number (10221763249).

Almost surely, 2^20443526497 is an apocalyptic number.

It is an amenable number.

20443526497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443526497 is an equidigital number, since it uses as much as digits as its factorization.

20443526497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 20443526497 in words is "twenty billion, four hundred forty-three million, five hundred twenty-six thousand, four hundred ninety-seven".