20045515 has 32 divisors (see below), whose sum is σ = 28748160. Its totient is φ = 13132800.

The previous prime is 20045507. The next prime is 20045521. The reversal of 20045515 is 51554002.

It is not a de Polignac number, because 20045515 - 2³ = 20045507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87421 + ... + 87649.

It is an arithmetic number, because the mean of its divisors is an integer number (898380).

Almost surely, 2^20045515 is an apocalyptic number.

20045515 is a deficient number, since it is larger than the sum of its proper divisors (8702645).

20045515 is a wasteful number, since it uses less digits than its factorization.

20045515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 20045515 is about 4477.2217948187. The cubic root of 20045515 is about 271.6475168522.

Adding to 20045515 its reverse (51554002), we get a palindrome (71599517).

The spelling of 20045515 in words is "twenty million, forty-five thousand, five hundred fifteen".