20871851433 has 8 divisors (see below), whose sum is σ = 27848215200. Its totient is φ = 13905027648.

The previous prime is 20871851417. The next prime is 20871851447. The reversal of 20871851433 is 33415817802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20871851433 - 2⁴ = 20871851417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20871851333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2379888 + ... + 2388641.

It is an arithmetic number, because the mean of its divisors is an integer number (3481026900).

Almost surely, 2^20871851433 is an apocalyptic number.

It is an amenable number.

20871851433 is a deficient number, since it is larger than the sum of its proper divisors (6976363767).

20871851433 is a wasteful number, since it uses less digits than its factorization.

20871851433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769991.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 20871851433 in words is "twenty billion, eight hundred seventy-one million, eight hundred fifty-one thousand, four hundred thirty-three".