20886647 has 8 divisors (see below), whose sum is σ = 21298416. Its totient is φ = 20477952.

The previous prime is 20886637. The next prime is 20886661. The reversal of 20886647 is 74668802.

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 20886647 - 2⁸ = 20886391 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 (20886617) 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, 16613 + ... + 17825.

It is an arithmetic number, because the mean of its divisors is an integer number (2662302).

Almost surely, 2^20886647 is an apocalyptic number.

20886647 is a deficient number, since it is larger than the sum of its proper divisors (411769).

20886647 is a wasteful number, since it uses less digits than its factorization.

20886647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 20886647 is about 4570.1911338586. The cubic root of 20886647 is about 275.3951212722.

The spelling of 20886647 in words is "twenty million, eight hundred eighty-six thousand, six hundred forty-seven".