20876887644937 has 2 divisors, whose sum is σ = 20876887644938. Its totient is φ = 20876887644936.

The previous prime is 20876887644917. The next prime is 20876887644967. The reversal of 20876887644937 is 73944678867802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18963725629696 + 1913162015241 = 4354736^2 + 1383171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20876887644937 is a prime.

It is not a weakly prime, because it can be changed into another prime (20876887644917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10438443822468 + 10438443822469.

It is an arithmetic number, because the mean of its divisors is an integer number (10438443822469).

Almost surely, 2^{20876887644937} is an apocalyptic number.

It is an amenable number.

20876887644937 is a deficient number, since it is larger than the sum of its proper divisors (1).

20876887644937 is an equidigital number, since it uses as much as digits as its factorization.

20876887644937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5462360064, while the sum is 79.

The spelling of 20876887644937 in words is "twenty trillion, eight hundred seventy-six billion, eight hundred eighty-seven million, six hundred forty-four thousand, nine hundred thirty-seven".