20041332665 has 4 divisors (see below), whose sum is σ = 24049599204. Its totient is φ = 16033066128.

The previous prime is 20041332659. The next prime is 20041332667. The reversal of 20041332665 is 56623314002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56623314002 = 2 ⋅28311657001.

It can be written as a sum of positive squares in 2 ways, for example, as 7968597289 + 12072735376 = 89267^2 + 109876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20041332665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20041332667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004133262 + ... + 2004133271.

It is an arithmetic number, because the mean of its divisors is an integer number (6012399801).

Almost surely, 2^20041332665 is an apocalyptic number.

It is an amenable number.

20041332665 is a deficient number, since it is larger than the sum of its proper divisors (4008266539).

20041332665 is an equidigital number, since it uses as much as digits as its factorization.

20041332665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008266538.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 20041332665 its reverse (56623314002), we get a palindrome (76664646667).

The spelling of 20041332665 in words is "twenty billion, forty-one million, three hundred thirty-two thousand, six hundred sixty-five".