20443502197 has 2 divisors, whose sum is σ = 20443502198. Its totient is φ = 20443502196.

The previous prime is 20443502173. The next prime is 20443502207. The reversal of 20443502197 is 79120534402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20426412241 + 17089956 = 142921^2 + 4134^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443502197 - 2²⁷ = 20309284469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443502797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221751098 + 10221751099.

It is an arithmetic number, because the mean of its divisors is an integer number (10221751099).

Almost surely, 2^20443502197 is an apocalyptic number.

It is an amenable number.

20443502197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443502197 is an equidigital number, since it uses as much as digits as its factorization.

20443502197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20443502197 in words is "twenty billion, four hundred forty-three million, five hundred two thousand, one hundred ninety-seven".