20504005 has 8 divisors (see below), whose sum is σ = 24676632. Its totient is φ = 16355328.

The previous prime is 20503999. The next prime is 20504009. The reversal of 20504005 is 50040502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 772641 + 19731364 = 879^2 + 4442^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20504005 - 2³ = 20503997 is a prime.

It is a super-3 number, since 3×20504005³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20504005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4044 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (3084579).

Almost surely, 2^20504005 is an apocalyptic number.

It is an amenable number.

20504005 is a deficient number, since it is larger than the sum of its proper divisors (4172627).

20504005 is a wasteful number, since it uses less digits than its factorization.

20504005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11975.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20504005 is about 4528.1348257312. The cubic root of 20504005 is about 273.7030054926.

Adding to 20504005 its reverse (50040502), we get a palindrome (70544507).

The spelling of 20504005 in words is "twenty million, five hundred four thousand, five".