20884687 has 8 divisors (see below), whose sum is σ = 22711536. Its totient is φ = 19124352.

The previous prime is 20884673. The next prime is 20884693. The reversal of 20884687 is 78648802.

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 20884687 - 2¹⁹ = 20360399 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 (20884657) 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, 15973 + ... + 17230.

It is an arithmetic number, because the mean of its divisors is an integer number (2838942).

Almost surely, 2^20884687 is an apocalyptic number.

20884687 is a deficient number, since it is larger than the sum of its proper divisors (1826849).

20884687 is a wasteful number, since it uses less digits than its factorization.

20884687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33257.

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 20884687 is about 4569.9766957830. The cubic root of 20884687 is about 275.3865066564.

The spelling of 20884687 in words is "twenty million, eight hundred eighty-four thousand, six hundred eighty-seven".