20886643 has 8 divisors (see below), whose sum is σ = 22040000. Its totient is φ = 19738728.

The previous prime is 20886637. The next prime is 20886661. The reversal of 20886643 is 34668802.

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 20886643 - 2¹⁷ = 20755571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20886683) 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, 8380 + ... + 10582.

It is an arithmetic number, because the mean of its divisors is an integer number (2755000).

Almost surely, 2^20886643 is an apocalyptic number.

20886643 is a deficient number, since it is larger than the sum of its proper divisors (1153357).

20886643 is a wasteful number, since it uses less digits than its factorization.

20886643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 20886643 is about 4570.1906962401. The cubic root of 20886643 is about 275.3951036919.

The spelling of 20886643 in words is "twenty million, eight hundred eighty-six thousand, six hundred forty-three".