20871466829 has 4 divisors (see below), whose sum is σ = 20877156000. Its totient is φ = 20865777660.

The previous prime is 20871466741. The next prime is 20871466843. The reversal of 20871466829 is 92866417802.

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 a cyclic number.

It is not a de Polignac number, because 20871466829 - 2¹⁶ = 20871401293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871466849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2839079 + ... + 2846420.

It is an arithmetic number, because the mean of its divisors is an integer number (5219289000).

Almost surely, 2^20871466829 is an apocalyptic number.

It is an amenable number.

20871466829 is a deficient number, since it is larger than the sum of its proper divisors (5689171).

20871466829 is an equidigital number, since it uses as much as digits as its factorization.

20871466829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689170.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 20871466829 in words is "twenty billion, eight hundred seventy-one million, four hundred sixty-six thousand, eight hundred twenty-nine".