20661411233 has 4 divisors (see below), whose sum is σ = 20661969840. Its totient is φ = 20660852628.

The previous prime is 20661411223. The next prime is 20661411257. The reversal of 20661411233 is 33211416602.

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 not a de Polignac number, because 20661411233 - 2¹⁶ = 20661345697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20661411196 and 20661411205.

It is not an unprimeable number, because it can be changed into a prime (20661411223) 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, 219563 + ... + 299216.

It is an arithmetic number, because the mean of its divisors is an integer number (5165492460).

Almost surely, 2^20661411233 is an apocalyptic number.

It is an amenable number.

20661411233 is a deficient number, since it is larger than the sum of its proper divisors (558607).

20661411233 is an equidigital number, since it uses as much as digits as its factorization.

20661411233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558606.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 20661411233 its reverse (33211416602), we get a palindrome (53872827835).

The spelling of 20661411233 in words is "twenty billion, six hundred sixty-one million, four hundred eleven thousand, two hundred thirty-three".