20050915 has 4 divisors (see below), whose sum is σ = 24061104. Its totient is φ = 16040728.

The previous prime is 20050913. The next prime is 20050937. The reversal of 20050915 is 51905002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51905002 = 2 ⋅25952501.

It is a cyclic number.

It is not a de Polignac number, because 20050915 - 2¹ = 20050913 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20050913) 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, 2005087 + ... + 2005096.

It is an arithmetic number, because the mean of its divisors is an integer number (6015276).

Almost surely, 2^20050915 is an apocalyptic number.

20050915 is a deficient number, since it is larger than the sum of its proper divisors (4010189).

20050915 is an equidigital number, since it uses as much as digits as its factorization.

20050915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010188.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 20050915 is about 4477.8248067561. The cubic root of 20050915 is about 271.6719074269.

Adding to 20050915 its reverse (51905002), we get a palindrome (71955917).

It can be divided in two parts, 200 and 50915, that added together give a palindrome (51115).

The spelling of 20050915 in words is "twenty million, fifty thousand, nine hundred fifteen".