20551143 has 8 divisors (see below), whose sum is σ = 27576688. Its totient is φ = 13613184.

The previous prime is 20551129. The next prime is 20551159. The reversal of 20551143 is 34115502.

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

It is not a de Polignac number, because 20551143 - 2¹⁶ = 20485607 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 7 ways as a sum of consecutive naturals, for example, 21346 + ... + 22287.

It is an arithmetic number, because the mean of its divisors is an integer number (3447086).

Almost surely, 2^20551143 is an apocalyptic number.

20551143 is a deficient number, since it is larger than the sum of its proper divisors (7025545).

20551143 is a wasteful number, since it uses less digits than its factorization.

20551143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43793.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20551143 is about 4533.3368504888. The cubic root of 20551143 is about 273.9125895542.

Adding to 20551143 its reverse (34115502), we get a palindrome (54666645).

The spelling of 20551143 in words is "twenty million, five hundred fifty-one thousand, one hundred forty-three".