20687350825877 has 2 divisors, whose sum is σ = 20687350825878. Its totient is φ = 20687350825876.

The previous prime is 20687350825847. The next prime is 20687350825919. The reversal of 20687350825877 is 77852805378602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18150931472881 + 2536419352996 = 4260391^2 + 1592614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20687350825877 - 2¹⁰ = 20687350824853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20687350825837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10343675412938 + 10343675412939.

It is an arithmetic number, because the mean of its divisors is an integer number (10343675412939).

Almost surely, 2^{20687350825877} is an apocalyptic number.

It is an amenable number.

20687350825877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20687350825877 is an equidigital number, since it uses as much as digits as its factorization.

20687350825877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 316108800, while the sum is 68.

The spelling of 20687350825877 in words is "twenty trillion, six hundred eighty-seven billion, three hundred fifty million, eight hundred twenty-five thousand, eight hundred seventy-seven".