20646086 has 8 divisors (see below), whose sum is σ = 32037120. Its totient is φ = 9967048.

The previous prime is 20646071. The next prime is 20646089. The reversal of 20646086 is 68064602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177926 + ... + 178041.

It is an arithmetic number, because the mean of its divisors is an integer number (4004640).

Almost surely, 2^20646086 is an apocalyptic number.

20646086 is a deficient number, since it is larger than the sum of its proper divisors (11391034).

20646086 is a wasteful number, since it uses less digits than its factorization.

20646086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355998.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20646086 is about 4543.7964302992. The cubic root of 20646086 is about 274.3337524627. Note that the first 3 decimals are identical.

The spelling of 20646086 in words is "twenty million, six hundred forty-six thousand, eighty-six".