20744143 has 12 divisors (see below), whose sum is σ = 25024080. Its totient is φ = 16842816.

The previous prime is 20744111. The next prime is 20744167. The reversal of 20744143 is 34144702.

It is not a de Polignac number, because 20744143 - 2⁵ = 20744111 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 (20744173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1578 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (2085340).

Almost surely, 2^20744143 is an apocalyptic number.

20744143 is a deficient number, since it is larger than the sum of its proper divisors (4279937).

20744143 is an equidigital number, since it uses as much as digits as its factorization.

20744143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8254 (or 8235 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20744143 is about 4554.5738549287. The cubic root of 20744143 is about 274.7673757289.

Adding to 20744143 its reverse (34144702), we get a palindrome (54888845).

The spelling of 20744143 in words is "twenty million, seven hundred forty-four thousand, one hundred forty-three".