20544145 has 8 divisors (see below), whose sum is σ = 24779304. Its totient is φ = 16351104.

The previous prime is 20544119. The next prime is 20544169. The reversal of 20544145 is 54144502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13778944 + 6765201 = 3712^2 + 2601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20544145 - 2⁵ = 20544113 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9444 + ... + 11413.

It is an arithmetic number, because the mean of its divisors is an integer number (3097413).

Almost surely, 2^20544145 is an apocalyptic number.

It is an amenable number.

20544145 is a deficient number, since it is larger than the sum of its proper divisors (4235159).

20544145 is a wasteful number, since it uses less digits than its factorization.

20544145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21059.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 20544145 is about 4532.5649471353. The cubic root of 20544145 is about 273.8814954537.

Adding to 20544145 its reverse (54144502), we get a palindrome (74688647).

The spelling of 20544145 in words is "twenty million, five hundred forty-four thousand, one hundred forty-five".