20208194437 has 2 divisors, whose sum is σ = 20208194438. Its totient is φ = 20208194436.

The previous prime is 20208194359. The next prime is 20208194483. The reversal of 20208194437 is 73449180202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19892563681 + 315630756 = 141041^2 + 17766^2 .

It is a cyclic number.

It is not a de Polignac number, because 20208194437 - 2⁷ = 20208194309 is a prime.

It is a super-2 number, since 2×20208194437² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20208194437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20208194137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104097218 + 10104097219.

It is an arithmetic number, because the mean of its divisors is an integer number (10104097219).

Almost surely, 2^20208194437 is an apocalyptic number.

It is an amenable number.

20208194437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20208194437 is an equidigital number, since it uses as much as digits as its factorization.

20208194437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 20208194437 in words is "twenty billion, two hundred eight million, one hundred ninety-four thousand, four hundred thirty-seven".