20815044 has 24 divisors (see below), whose sum is σ = 49754208. Its totient is φ = 6768960.

The previous prime is 20815037. The next prime is 20815049. The reversal of 20815044 is 44051802.

It is not an unprimeable number, because it can be changed into a prime (20815049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20662 + ... + 21645.

It is an arithmetic number, because the mean of its divisors is an integer number (2073092).

Almost surely, 2^20815044 is an apocalyptic number.

It is an amenable number.

20815044 is an abundant number, since it is smaller than the sum of its proper divisors (28939164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20815044 is a wasteful number, since it uses less digits than its factorization.

20815044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42355 (or 42353 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20815044 is about 4562.3507098863. The cubic root of 20815044 is about 275.0800604364.

Adding to 20815044 its reverse (44051802), we get a palindrome (64866846).

The spelling of 20815044 in words is "twenty million, eight hundred fifteen thousand, forty-four".