20550445 has 4 divisors (see below), whose sum is σ = 24660540. Its totient is φ = 16440352.

The previous prime is 20550443. The next prime is 20550463. The reversal of 20550445 is 54405502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54405502 = 2 ⋅27202751.

It can be written as a sum of positive squares in 2 ways, for example, as 2758921 + 17791524 = 1661^2 + 4218^2 .

It is a cyclic number.

It is not a de Polignac number, because 20550445 - 2¹ = 20550443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055040 + ... + 2055049.

It is an arithmetic number, because the mean of its divisors is an integer number (6165135).

Almost surely, 2^20550445 is an apocalyptic number.

It is an amenable number.

20550445 is a deficient number, since it is larger than the sum of its proper divisors (4110095).

20550445 is an equidigital number, since it uses as much as digits as its factorization.

20550445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110094.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 20550445 is about 4533.2598646007. The cubic root of 20550445 is about 273.9094884590.

Adding to 20550445 its reverse (54405502), we get a palindrome (74955947).

The spelling of 20550445 in words is "twenty million, five hundred fifty thousand, four hundred forty-five".