20838143 has 4 divisors (see below), whose sum is σ = 21033000. Its totient is φ = 20643288.

The previous prime is 20838137. The next prime is 20838157. The reversal of 20838143 is 34183802.

It is a happy number.

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 20838143 - 2¹⁶ = 20772607 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 (20838113) 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, 97268 + ... + 97481.

It is an arithmetic number, because the mean of its divisors is an integer number (5258250).

Almost surely, 2^20838143 is an apocalyptic number.

20838143 is a deficient number, since it is larger than the sum of its proper divisors (194857).

20838143 is a wasteful number, since it uses less digits than its factorization.

20838143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194856.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20838143 is about 4564.8814880564. The cubic root of 20838143 is about 275.1817773378.

The spelling of 20838143 in words is "twenty million, eight hundred thirty-eight thousand, one hundred forty-three".