20288664438437 has 8 divisors (see below), whose sum is σ = 20322124283736. Its totient is φ = 20255206461952.

The previous prime is 20288664438433. The next prime is 20288664438517. The reversal of 20288664438437 is 73483446688202.

It is a Cunningham number, because it is equal to 4504294²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 587574373156 + 19701090065281 = 766534^2 + 4438591^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20288664438437 - 2² = 20288664438433 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20288664438433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22166333 + ... + 23063469.

It is an arithmetic number, because the mean of its divisors is an integer number (2540265535467).

Almost surely, 2^{20288664438437} is an apocalyptic number.

It is an amenable number.

20288664438437 is a deficient number, since it is larger than the sum of its proper divisors (33459845299).

20288664438437 is an equidigital number, since it uses as much as digits as its factorization.

20288664438437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934407.

The product of its (nonzero) digits is 297271296, while the sum is 65.

The spelling of 20288664438437 in words is "twenty trillion, two hundred eighty-eight billion, six hundred sixty-four million, four hundred thirty-eight thousand, four hundred thirty-seven".