20843887847 has 8 divisors (see below), whose sum is σ = 20870198400. Its totient is φ = 20817596160.

The previous prime is 20843887807. The next prime is 20843887891. The reversal of 20843887847 is 74878834802.

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 20843887847 - 2¹² = 20843883751 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 (20843887807) 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, 4147178 + ... + 4152200.

It is an arithmetic number, because the mean of its divisors is an integer number (2608774800).

Almost surely, 2^20843887847 is an apocalyptic number.

20843887847 is a deficient number, since it is larger than the sum of its proper divisors (26310553).

20843887847 is a wasteful number, since it uses less digits than its factorization.

20843887847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433.

The product of its (nonzero) digits is 19267584, while the sum is 59.

The spelling of 20843887847 in words is "twenty billion, eight hundred forty-three million, eight hundred eighty-seven thousand, eight hundred forty-seven".