20605144033 has 4 divisors (see below), whose sum is σ = 20605482288. Its totient is φ = 20604805780.

The previous prime is 20605144019. The next prime is 20605144039. The reversal of 20605144033 is 33044150602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20605144033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20605143992 and 20605144010.

It is not an unprimeable number, because it can be changed into a prime (20605144039) 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, 49591 + ... + 208972.

It is an arithmetic number, because the mean of its divisors is an integer number (5151370572).

Almost surely, 2^20605144033 is an apocalyptic number.

It is an amenable number.

20605144033 is a deficient number, since it is larger than the sum of its proper divisors (338255).

20605144033 is an equidigital number, since it uses as much as digits as its factorization.

20605144033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338254.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 20605144033 its reverse (33044150602), we get a palindrome (53649294635).

The spelling of 20605144033 in words is "twenty billion, six hundred five million, one hundred forty-four thousand, thirty-three".