20649303871 has 16 divisors (see below), whose sum is σ = 24051774528. Its totient is φ = 17360179200.

The previous prime is 20649303863. The next prime is 20649303889. The reversal of 20649303871 is 17830394602.

It is not a de Polignac number, because 20649303871 - 2³ = 20649303863 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 (20649303271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1656241 + ... + 1668661.

It is an arithmetic number, because the mean of its divisors is an integer number (1503235908).

Almost surely, 2^20649303871 is an apocalyptic number.

20649303871 is a deficient number, since it is larger than the sum of its proper divisors (3402470657).

20649303871 is a wasteful number, since it uses less digits than its factorization.

20649303871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16962.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 20649303871 in words is "twenty billion, six hundred forty-nine million, three hundred three thousand, eight hundred seventy-one".