20663805487837 has 8 divisors (see below), whose sum is σ = 21283095575000. Its totient is φ = 20047715866944.

The previous prime is 20663805487799. The next prime is 20663805487877. The reversal of 20663805487837 is 73878450836602.

It can be written as a sum of positive squares in 4 ways, for example, as 15892293872196 + 4771511615641 = 3986514^2 + 2184379^2 .

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 20663805487837 - 2²³ = 20663797099229 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 (20663805487877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800103462 + ... + 800129287.

It is an arithmetic number, because the mean of its divisors is an integer number (2660386946875).

Almost surely, 2^{20663805487837} is an apocalyptic number.

It is an amenable number.

20663805487837 is a deficient number, since it is larger than the sum of its proper divisors (619290087163).

20663805487837 is a wasteful number, since it uses less digits than its factorization.

20663805487837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600233135.

The product of its (nonzero) digits is 325140480, while the sum is 67.

The spelling of 20663805487837 in words is "twenty trillion, six hundred sixty-three billion, eight hundred five million, four hundred eighty-seven thousand, eight hundred thirty-seven".