20530445 has 16 divisors (see below), whose sum is σ = 26656560. Its totient is φ = 15089664.

The previous prime is 20530427. The next prime is 20530453. The reversal of 20530445 is 54403502.

It can be written as a sum of positive squares in 8 ways, for example, as 3108169 + 17422276 = 1763^2 + 4174^2 .

It is a cyclic number.

It is not a de Polignac number, because 20530445 - 2¹⁴ = 20514061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20530445.

It is a congruent number.

It is an unprimeable number.

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, 16091 + ... + 17319.

It is an arithmetic number, because the mean of its divisors is an integer number (1666035).

Almost surely, 2^20530445 is an apocalyptic number.

It is an amenable number.

20530445 is a deficient number, since it is larger than the sum of its proper divisors (6126115).

20530445 is a wasteful number, since it uses less digits than its factorization.

20530445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20530445 is about 4531.0534095285. The cubic root of 20530445 is about 273.8206020158.

Adding to 20530445 its reverse (54403502), we get a palindrome (74933947).

The spelling of 20530445 in words is "twenty million, five hundred thirty thousand, four hundred forty-five".