20871729473 has 8 divisors (see below), whose sum is σ = 23855472192. Its totient is φ = 17888503536.

The previous prime is 20871729469. The next prime is 20871729499. The reversal of 20871729473 is 37492717802.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20871729473 - 2² = 20871729469 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871729773) 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, 38390 + ... + 207887.

It is an arithmetic number, because the mean of its divisors is an integer number (2981934024).

Almost surely, 2^20871729473 is an apocalyptic number.

It is an amenable number.

20871729473 is a deficient number, since it is larger than the sum of its proper divisors (2983742719).

20871729473 is a wasteful number, since it uses less digits than its factorization.

20871729473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258391.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 20871729473 in words is "twenty billion, eight hundred seventy-one million, seven hundred twenty-nine thousand, four hundred seventy-three".