20206686 has 16 divisors (see below), whose sum is σ = 41399568. Its totient is φ = 6571200.

The previous prime is 20206661. The next prime is 20206687. The reversal of 20206686 is 68660202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20206687) 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, 40825 + ... + 41316.

It is an arithmetic number, because the mean of its divisors is an integer number (2587473).

Almost surely, 2^20206686 is an apocalyptic number.

20206686 is an abundant number, since it is smaller than the sum of its proper divisors (21192882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20206686 is a wasteful number, since it uses less digits than its factorization.

20206686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82187.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20206686 is about 4495.1847570484. The cubic root of 20206686 is about 272.3736125172.

Adding to 20206686 its reverse (68660202), we get a palindrome (88866888).

The spelling of 20206686 in words is "twenty million, two hundred six thousand, six hundred eighty-six".