20908338127869 has 4 divisors (see below), whose sum is σ = 27877784170496. Its totient is φ = 13938892085244.

The previous prime is 20908338127849. The next prime is 20908338127907. The reversal of 20908338127869 is 96872183380902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20908338127869 - 2⁵ = 20908338127837 is a prime.

It is a super-2 number, since 2×20908338127869² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908338127819) 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 in 3 ways as a sum of consecutive naturals, for example, 3484723021309 + ... + 3484723021314.

It is an arithmetic number, because the mean of its divisors is an integer number (6969446042624).

Almost surely, 2^{20908338127869} is an apocalyptic number.

It is an amenable number.

20908338127869 is a deficient number, since it is larger than the sum of its proper divisors (6969446042627).

20908338127869 is an equidigital number, since it uses as much as digits as its factorization.

20908338127869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6969446042626.

The product of its (nonzero) digits is 62705664, while the sum is 66.

The spelling of 20908338127869 in words is "twenty trillion, nine hundred eight billion, three hundred thirty-eight million, one hundred twenty-seven thousand, eight hundred sixty-nine".