20734143 has 4 divisors (see below), whose sum is σ = 27645528. Its totient is φ = 13822760.

The previous prime is 20734141. The next prime is 20734157. The reversal of 20734143 is 34143702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20734143 - 2¹ = 20734141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455688 + ... + 3455693.

It is an arithmetic number, because the mean of its divisors is an integer number (6911382).

Almost surely, 2^20734143 is an apocalyptic number.

20734143 is a deficient number, since it is larger than the sum of its proper divisors (6911385).

20734143 is an equidigital number, since it uses as much as digits as its factorization.

20734143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6911384.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 20734143 is about 4553.4759250489. The cubic root of 20734143 is about 274.7232168324.

Adding to 20734143 its reverse (34143702), we get a palindrome (54877845).

It can be divided in two parts, 2073 and 4143, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 20734143 in words is "twenty million, seven hundred thirty-four thousand, one hundred forty-three".