20844872621 has 8 divisors (see below), whose sum is σ = 22000804320. Its totient is φ = 19694824272.

The previous prime is 20844872617. The next prime is 20844872623. The reversal of 20844872621 is 12627844802.

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 20844872621 - 2² = 20844872617 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 (20844872623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1463555 + ... + 1477728.

It is an arithmetic number, because the mean of its divisors is an integer number (2750100540).

Almost surely, 2^20844872621 is an apocalyptic number.

It is an amenable number.

20844872621 is a deficient number, since it is larger than the sum of its proper divisors (1155931699).

20844872621 is a wasteful number, since it uses less digits than its factorization.

20844872621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941675.

The product of its (nonzero) digits is 344064, while the sum is 44.

The spelling of 20844872621 in words is "twenty billion, eight hundred forty-four million, eight hundred seventy-two thousand, six hundred twenty-one".