20530290 has 32 divisors (see below), whose sum is σ = 53752896. Its totient is φ = 4976960.

The previous prime is 20530273. The next prime is 20530291. The reversal of 20530290 is 9203502.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20530291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30777 + ... + 31436.

It is an arithmetic number, because the mean of its divisors is an integer number (1679778).

Almost surely, 2^20530290 is an apocalyptic number.

20530290 is an abundant number, since it is smaller than the sum of its proper divisors (33222606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20530290 is a wasteful number, since it uses less digits than its factorization.

20530290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62234.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20530290 is about 4531.0363053059. The cubic root of 20530290 is about 273.8199129205.

Adding to 20530290 its reverse (9203502), we get a palindrome (29733792).

The spelling of 20530290 in words is "twenty million, five hundred thirty thousand, two hundred ninety".