20017045 has 8 divisors (see below), whose sum is σ = 24087096. Its totient is φ = 15969216.

The previous prime is 20017043. The next prime is 20017091. The reversal of 20017045 is 54071002.

It can be written as a sum of positive squares in 4 ways, for example, as 178929 + 19838116 = 423^2 + 4454^2 .

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 20017045 - 2¹ = 20017043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20017043) 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, 3502 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (3010887).

Almost surely, 2^20017045 is an apocalyptic number.

It is an amenable number.

20017045 is a deficient number, since it is larger than the sum of its proper divisors (4070051).

20017045 is a wasteful number, since it uses less digits than its factorization.

20017045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20017045 is about 4474.0412380755. The cubic root of 20017045 is about 271.5188518441.

Adding to 20017045 its reverse (54071002), we get a palindrome (74088047).

The spelling of 20017045 in words is "twenty million, seventeen thousand, forty-five".