20687350825847 has 2 divisors, whose sum is σ = 20687350825848. Its totient is φ = 20687350825846.

The previous prime is 20687350825837. The next prime is 20687350825877. The reversal of 20687350825847 is 74852805378602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20687350825847 - 2¹⁸ = 20687350563703 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 polite number, since it can be written as a sum of consecutive naturals, namely, 10343675412923 + 10343675412924.

It is an arithmetic number, because the mean of its divisors is an integer number (10343675412924).

Almost surely, 2^{20687350825847} is an apocalyptic number.

20687350825847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20687350825847 is an equidigital number, since it uses as much as digits as its factorization.

20687350825847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180633600, while the sum is 65.

The spelling of 20687350825847 in words is "twenty trillion, six hundred eighty-seven billion, three hundred fifty million, eight hundred twenty-five thousand, eight hundred forty-seven".