20512205 has 32 divisors (see below), whose sum is σ = 29804544. Its totient is φ = 13248576.

The previous prime is 20512201. The next prime is 20512213. The reversal of 20512205 is 50221502.

It is a cyclic number.

It is not a de Polignac number, because 20512205 - 2² = 20512201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66662 + ... + 66968.

It is an arithmetic number, because the mean of its divisors is an integer number (931392).

Almost surely, 2^20512205 is an apocalyptic number.

It is an amenable number.

20512205 is a deficient number, since it is larger than the sum of its proper divisors (9292339).

20512205 is a wasteful number, since it uses less digits than its factorization.

20512205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20512205 is about 4529.0401852931. The cubic root of 20512205 is about 273.7394872355.

Adding to 20512205 its reverse (50221502), we get a palindrome (70733707).

The spelling of 20512205 in words is "twenty million, five hundred twelve thousand, two hundred five".