20053438643737 has 4 divisors (see below), whose sum is σ = 20053526146996. Its totient is φ = 20053351140480.

The previous prime is 20053438643731. The next prime is 20053438643759. The reversal of 20053438643737 is 73734683435002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286202530441 + 19767236113296 = 534979^2 + 4446036^2 .

It is a cyclic number.

It is not a de Polignac number, because 20053438643737 - 2³⁹ = 19503682829849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20053438643731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43406964 + ... + 43866517.

It is an arithmetic number, because the mean of its divisors is an integer number (5013381536749).

Almost surely, 2^{20053438643737} is an apocalyptic number.

It is an amenable number.

20053438643737 is a deficient number, since it is larger than the sum of its proper divisors (87503259).

20053438643737 is an equidigital number, since it uses as much as digits as its factorization.

20053438643737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87503258.

The product of its (nonzero) digits is 30481920, while the sum is 55.

The spelling of 20053438643737 in words is "twenty trillion, fifty-three billion, four hundred thirty-eight million, six hundred forty-three thousand, seven hundred thirty-seven".