20489143 has 4 divisors (see below), whose sum is σ = 20596608. Its totient is φ = 20381680.

The previous prime is 20489141. The next prime is 20489149. The reversal of 20489143 is 34198402.

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 20489143 - 2¹ = 20489141 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489141) 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, 53446 + ... + 53827.

It is an arithmetic number, because the mean of its divisors is an integer number (5149152).

Almost surely, 2^20489143 is an apocalyptic number.

20489143 is a deficient number, since it is larger than the sum of its proper divisors (107465).

20489143 is a wasteful number, since it uses less digits than its factorization.

20489143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107464.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20489143 is about 4526.4934552035. The cubic root of 20489143 is about 273.6368597602.

The spelling of 20489143 in words is "twenty million, four hundred eighty-nine thousand, one hundred forty-three".