20686863 has 8 divisors (see below), whose sum is σ = 27784368. Its totient is φ = 13690304.

The previous prime is 20686847. The next prime is 20686871. The reversal of 20686863 is 36868602.

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 20686863 - 2⁴ = 20686847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24756 + ... + 25577.

It is an arithmetic number, because the mean of its divisors is an integer number (3473046).

Almost surely, 2^20686863 is an apocalyptic number.

20686863 is a deficient number, since it is larger than the sum of its proper divisors (7097505).

20686863 is a wasteful number, since it uses less digits than its factorization.

20686863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50473.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 20686863 is about 4548.2813237530. The cubic root of 20686863 is about 274.5142410852.

The spelling of 20686863 in words is "twenty million, six hundred eighty-six thousand, eight hundred sixty-three".