20550045 has 32 divisors (see below), whose sum is σ = 34025472. Its totient is φ = 10585152.

The previous prime is 20550041. The next prime is 20550071. The reversal of 20550045 is 54005502.

It is not a de Polignac number, because 20550045 - 2² = 20550041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550041) 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 31 ways as a sum of consecutive naturals, for example, 72474 + ... + 72756.

It is an arithmetic number, because the mean of its divisors is an integer number (1063296).

Almost surely, 2^20550045 is an apocalyptic number.

It is an amenable number.

20550045 is a deficient number, since it is larger than the sum of its proper divisors (13475427).

20550045 is a wasteful number, since it uses less digits than its factorization.

20550045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20550045 is about 4533.2157460240. The cubic root of 20550045 is about 273.9077112954.

Adding to 20550045 its reverse (54005502), we get a palindrome (74555547).

The spelling of 20550045 in words is "twenty million, five hundred fifty thousand, forty-five".