20205205 has 8 divisors (see below), whose sum is σ = 24327072. Its totient is φ = 16110288.

The previous prime is 20205193. The next prime is 20205223. The reversal of 20205205 is 50250202.

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

It is a cyclic number.

It is not a de Polignac number, because 20205205 - 2⁷ = 20205077 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 7 ways as a sum of consecutive naturals, for example, 5047 + ... + 8116.

It is an arithmetic number, because the mean of its divisors is an integer number (3040884).

Almost surely, 2^20205205 is an apocalyptic number.

It is an amenable number.

20205205 is a deficient number, since it is larger than the sum of its proper divisors (4121867).

20205205 is a wasteful number, since it uses less digits than its factorization.

20205205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13475.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20205205 is about 4495.0200222023. The cubic root of 20205205 is about 272.3669580337.

Adding to 20205205 its reverse (50250202), we get a palindrome (70455407).

It can be divided in two parts, 2020 and 5205, that added together give a square (7225 = 85²).

The spelling of 20205205 in words is "twenty million, two hundred five thousand, two hundred five".