20045015 has 4 divisors (see below), whose sum is σ = 24054024. Its totient is φ = 16036008.

The previous prime is 20044987. The next prime is 20045017. The reversal of 20045015 is 51054002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20045015 - 2¹² = 20040919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20044984 and 20045002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004497 + ... + 2004506.

It is an arithmetic number, because the mean of its divisors is an integer number (6013506).

Almost surely, 2^20045015 is an apocalyptic number.

20045015 is a deficient number, since it is larger than the sum of its proper divisors (4009009).

20045015 is an equidigital number, since it uses as much as digits as its factorization.

20045015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009008.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20045015 is about 4477.1659562719. The cubic root of 20045015 is about 271.6452582441.

Adding to 20045015 its reverse (51054002), we get a palindrome (71099017).

The spelling of 20045015 in words is "twenty million, forty-five thousand, fifteen".