20808207 has 12 divisors (see below), whose sum is σ = 34350160. Its totient is φ = 11890368.

The previous prime is 20808107. The next prime is 20808233. The reversal of 20808207 is 70280802.

It is not a de Polignac number, because 20808207 - 2⁷ = 20808079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165082 + ... + 165207.

Almost surely, 2^20808207 is an apocalyptic number.

20808207 is a deficient number, since it is larger than the sum of its proper divisors (13541953).

20808207 is a wasteful number, since it uses less digits than its factorization.

20808207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330302 (or 330299 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 20808207 is about 4561.6013635564. The cubic root of 20808207 is about 275.0499391400.

The spelling of 20808207 in words is "twenty million, eight hundred eight thousand, two hundred seven".