20115005 has 4 divisors (see below), whose sum is σ = 24138012. Its totient is φ = 16092000.

The previous prime is 20114993. The next prime is 20115023. The reversal of 20115005 is 50051102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9369721 + 10745284 = 3061^2 + 3278^2 .

It is not a de Polignac number, because 20115005 - 2²⁰ = 19066429 is a prime.

It is a super-2 number, since 2×20115005² = 809226852300050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011496 + ... + 2011505.

It is an arithmetic number, because the mean of its divisors is an integer number (6034503).

Almost surely, 2^20115005 is an apocalyptic number.

It is an amenable number.

20115005 is a deficient number, since it is larger than the sum of its proper divisors (4023007).

20115005 is an equidigital number, since it uses as much as digits as its factorization.

20115005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023006.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 20115005 is about 4484.9754737345. The cubic root of 20115005 is about 271.9610535716.

Adding to 20115005 its reverse (50051102), we get a palindrome (70166107).

The spelling of 20115005 in words is "twenty million, one hundred fifteen thousand, five".