206220005 has 4 divisors (see below), whose sum is σ = 247464012. Its totient is φ = 164976000.

The previous prime is 206219947. The next prime is 206220019. The reversal of 206220005 is 500022602.

206220005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500022602 = 2 ⋅250011301.

It can be written as a sum of positive squares in 2 ways, for example, as 58767556 + 147452449 = 7666^2 + 12143^2 .

It is not a de Polignac number, because 206220005 - 2¹⁰ = 206218981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20621996 + ... + 20622005.

It is an arithmetic number, because the mean of its divisors is an integer number (61866003).

Almost surely, 2^206220005 is an apocalyptic number.

It is an amenable number.

206220005 is a deficient number, since it is larger than the sum of its proper divisors (41244007).

206220005 is an equidigital number, since it uses as much as digits as its factorization.

206220005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41244006.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 206220005 is about 14360.3622865163. The cubic root of 206220005 is about 590.8042321772.

Adding to 206220005 its reverse (500022602), we get a palindrome (706242607).

The spelling of 206220005 in words is "two hundred six million, two hundred twenty thousand, five".