20732143 has 2 divisors, whose sum is σ = 20732144. Its totient is φ = 20732142.

The previous prime is 20732141. The next prime is 20732161. The reversal of 20732143 is 34123702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20732143 - 2¹ = 20732141 is a prime.

It is a super-3 number, since 3×20732143³ (a number of 23 digits) contains 333 as substring.

Together with 20732141, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20732141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366071 + 10366072.

It is an arithmetic number, because the mean of its divisors is an integer number (10366072).

Almost surely, 2^20732143 is an apocalyptic number.

20732143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20732143 is an equidigital number, since it uses as much as digits as its factorization.

20732143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20732143 is about 4553.2563073036. The cubic root of 20732143 is about 274.7143833493.

Adding to 20732143 its reverse (34123702), we get a palindrome (54855845).

The spelling of 20732143 in words is "twenty million, seven hundred thirty-two thousand, one hundred forty-three".