20205530 has 16 divisors (see below), whose sum is σ = 36693864. Its totient is φ = 8010240.

The previous prime is 20205529. The next prime is 20205533. The reversal of 20205530 is 3550202.

It can be written as a sum of positive squares in 4 ways, for example, as 8720209 + 11485321 = 2953^2 + 3389^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20205499 and 20205508.

It is not an unprimeable number, because it can be changed into a prime (20205533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7811 + ... + 10070.

Almost surely, 2^20205530 is an apocalyptic number.

20205530 is a deficient number, since it is larger than the sum of its proper divisors (16488334).

20205530 is a wasteful number, since it uses less digits than its factorization.

20205530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18001.

The product of its (nonzero) digits is 300, while the sum is 17.

The square root of 20205530 is about 4495.0561731751. The cubic root of 20205530 is about 272.3684183635.

Adding to 20205530 its reverse (3550202), we get a palindrome (23755732).

The spelling of 20205530 in words is "twenty million, two hundred five thousand, five hundred thirty".