20044945 has 8 divisors (see below), whose sum is σ = 24883560. Its totient is φ = 15482880.

The previous prime is 20044939. The next prime is 20044949. The reversal of 20044945 is 54944002.

It can be written as a sum of positive squares in 4 ways, for example, as 117649 + 19927296 = 343^2 + 4464^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-20044945 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20044949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68976 + ... + 69265.

It is an arithmetic number, because the mean of its divisors is an integer number (3110445).

Almost surely, 2^20044945 is an apocalyptic number.

It is an amenable number.

20044945 is a deficient number, since it is larger than the sum of its proper divisors (4838615).

20044945 is a wasteful number, since it uses less digits than its factorization.

20044945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138275.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20044945 is about 4477.1581388198. The cubic root of 20044945 is about 271.6449420360.

Adding to 20044945 its reverse (54944002), we get a palindrome (74988947).

The spelling of 20044945 in words is "twenty million, forty-four thousand, nine hundred forty-five".