20443339597 has 2 divisors, whose sum is σ = 20443339598. Its totient is φ = 20443339596.

The previous prime is 20443339571. The next prime is 20443339601. The reversal of 20443339597 is 79593334402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12376785001 + 8066554596 = 111251^2 + 89814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20443339597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20443339597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443339507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221669798 + 10221669799.

It is an arithmetic number, because the mean of its divisors is an integer number (10221669799).

Almost surely, 2^20443339597 is an apocalyptic number.

It is an amenable number.

20443339597 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443339597 is an equidigital number, since it uses as much as digits as its factorization.

20443339597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 49.

The spelling of 20443339597 in words is "twenty billion, four hundred forty-three million, three hundred thirty-nine thousand, five hundred ninety-seven".