20686106 has 16 divisors (see below), whose sum is σ = 36685440. Its totient is φ = 8559600.

The previous prime is 20686097. The next prime is 20686109. The reversal of 20686106 is 60168602.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (20686109) 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, 25070 + ... + 25881.

It is an arithmetic number, because the mean of its divisors is an integer number (2292840).

Almost surely, 2^20686106 is an apocalyptic number.

20686106 is a deficient number, since it is larger than the sum of its proper divisors (15999334).

20686106 is a wasteful number, since it uses less digits than its factorization.

20686106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50989.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20686106 is about 4548.1981047443. The cubic root of 20686106 is about 274.5108925863.

The spelling of 20686106 in words is "twenty million, six hundred eighty-six thousand, one hundred six".