20616143 has 2 divisors, whose sum is σ = 20616144. Its totient is φ = 20616142.

The previous prime is 20616139. The next prime is 20616161. The reversal of 20616143 is 34161602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20616143 - 2² = 20616139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20616133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308071 + 10308072.

It is an arithmetic number, because the mean of its divisors is an integer number (10308072).

Almost surely, 2^20616143 is an apocalyptic number.

20616143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616143 is an equidigital number, since it uses as much as digits as its factorization.

20616143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20616143 is about 4540.5003028301. The cubic root of 20616143 is about 274.2010662988.

Adding to 20616143 its reverse (34161602), we get a palindrome (54777745).

The spelling of 20616143 in words is "twenty million, six hundred sixteen thousand, one hundred forty-three".