20804207 has 6 divisors (see below), whose sum is σ = 21106464. Its totient is φ = 20506220.

The previous prime is 20804159. The next prime is 20804257. The reversal of 20804207 is 70240802.

It is not a de Polignac number, because 20804207 - 2¹⁰ = 20803183 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 (20804257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2978 + ... + 7104.

It is an arithmetic number, because the mean of its divisors is an integer number (3517744).

Almost surely, 2^20804207 is an apocalyptic number.

20804207 is a deficient number, since it is larger than the sum of its proper divisors (302257).

20804207 is an frugal number, since it uses more digits than its factorization.

20804207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20804207 is about 4561.1628999631. The cubic root of 20804207 is about 275.0323135583.

The spelling of 20804207 in words is "twenty million, eight hundred four thousand, two hundred seven".