20609143 has 2 divisors, whose sum is σ = 20609144. Its totient is φ = 20609142.

The previous prime is 20609137. The next prime is 20609153. The reversal of 20609143 is 34190602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20609143 - 2¹⁷ = 20478071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20609123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10304571 + 10304572.

It is an arithmetic number, because the mean of its divisors is an integer number (10304572).

Almost surely, 2^20609143 is an apocalyptic number.

20609143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20609143 is an equidigital number, since it uses as much as digits as its factorization.

20609143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20609143 is about 4539.7293972218. The cubic root of 20609143 is about 274.1700287320.

Adding to 20609143 its reverse (34190602), we get a palindrome (54799745).

The spelling of 20609143 in words is "twenty million, six hundred nine thousand, one hundred forty-three".