20637768537739 has 8 divisors (see below), whose sum is σ = 21383117274240. Its totient is φ = 19902291970176.

The previous prime is 20637768537731. The next prime is 20637768537761. The reversal of 20637768537739 is 93773586773602.

It is a happy number.

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 20637768537739 - 2³ = 20637768537731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20637768537731) 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, 2468037979 + ... + 2468046340.

It is an arithmetic number, because the mean of its divisors is an integer number (2672889659280).

Almost surely, 2^{20637768537739} is an apocalyptic number.

20637768537739 is a deficient number, since it is larger than the sum of its proper divisors (745348736501).

20637768537739 is a wasteful number, since it uses less digits than its factorization.

20637768537739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936084469.

The product of its (nonzero) digits is 1680315840, while the sum is 73.

The spelling of 20637768537739 in words is "twenty trillion, six hundred thirty-seven billion, seven hundred sixty-eight million, five hundred thirty-seven thousand, seven hundred thirty-nine".