20686207 has 8 divisors (see below), whose sum is σ = 21422720. Its totient is φ = 19954080.

The previous prime is 20686201. The next prime is 20686241. The reversal of 20686207 is 70268602.

It is a happy number.

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

It is not a de Polignac number, because 20686207 - 2¹¹ = 20684159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10669 + ... + 12457.

It is an arithmetic number, because the mean of its divisors is an integer number (2677840).

Almost surely, 2^20686207 is an apocalyptic number.

20686207 is a deficient number, since it is larger than the sum of its proper divisors (736513).

20686207 is a wasteful number, since it uses less digits than its factorization.

20686207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20686207 is about 4548.2092080290. The cubic root of 20686207 is about 274.5113393524.

The spelling of 20686207 in words is "twenty million, six hundred eighty-six thousand, two hundred seven".