20004665 has 8 divisors (see below), whose sum is σ = 25417800. Its totient is φ = 15062272.

The previous prime is 20004583. The next prime is 20004667. The reversal of 20004665 is 56640002.

It can be written as a sum of positive squares in 4 ways, for example, as 9265936 + 10738729 = 3044^2 + 3277^2 .

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

It is not a de Polignac number, because 20004665 - 2¹² = 20000569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20004665.

It is not an unprimeable number, because it can be changed into a prime (20004667) 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, 117590 + ... + 117759.

It is an arithmetic number, because the mean of its divisors is an integer number (3177225).

Almost surely, 2^20004665 is an apocalyptic number.

It is an amenable number.

20004665 is a deficient number, since it is larger than the sum of its proper divisors (5413135).

20004665 is a wasteful number, since it uses less digits than its factorization.

20004665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235371.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20004665 is about 4472.6574874452. The cubic root of 20004665 is about 271.4628646158.

Adding to 20004665 its reverse (56640002), we get a palindrome (76644667).

The spelling of 20004665 in words is "twenty million, four thousand, six hundred sixty-five".