20707143 has 4 divisors (see below), whose sum is σ = 27609528. Its totient is φ = 13804760.

The previous prime is 20707133. The next prime is 20707151. The reversal of 20707143 is 34170702.

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 20707143 - 2²⁴ = 3929927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20707133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3451188 + ... + 3451193.

It is an arithmetic number, because the mean of its divisors is an integer number (6902382).

Almost surely, 2^20707143 is an apocalyptic number.

20707143 is a deficient number, since it is larger than the sum of its proper divisors (6902385).

20707143 is an equidigital number, since it uses as much as digits as its factorization.

20707143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6902384.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 20707143 is about 4550.5101911764. The cubic root of 20707143 is about 274.6039168467.

Adding to 20707143 its reverse (34170702), we get a palindrome (54877845).

The spelling of 20707143 in words is "twenty million, seven hundred seven thousand, one hundred forty-three".