20551133 has 4 divisors (see below), whose sum is σ = 20576928. Its totient is φ = 20525340.

The previous prime is 20551129. The next prime is 20551159. The reversal of 20551133 is 33115502.

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 20551133 - 2² = 20551129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551183) 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, 11663 + ... + 13308.

It is an arithmetic number, because the mean of its divisors is an integer number (5144232).

Almost surely, 2^20551133 is an apocalyptic number.

It is an amenable number.

20551133 is a deficient number, since it is larger than the sum of its proper divisors (25795).

20551133 is an equidigital number, since it uses as much as digits as its factorization.

20551133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25794.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 20551133 is about 4533.3357475484. The cubic root of 20551133 is about 273.9125451264.

Adding to 20551133 its reverse (33115502), we get a palindrome (53666635).

The spelling of 20551133 in words is "twenty million, five hundred fifty-one thousand, one hundred thirty-three".