20143191 has 8 divisors (see below), whose sum is σ = 26946304. Its totient is φ = 13384440.

The previous prime is 20143171. The next prime is 20143219. The reversal of 20143191 is 19134102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20143191 - 2¹³ = 20134999 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 (20143171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10015 + ... + 11856.

It is an arithmetic number, because the mean of its divisors is an integer number (3368288).

Almost surely, 2^20143191 is an apocalyptic number.

20143191 is a deficient number, since it is larger than the sum of its proper divisors (6803113).

20143191 is a wasteful number, since it uses less digits than its factorization.

20143191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22181.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20143191 is about 4488.1166428693. The cubic root of 20143191 is about 272.0880220815.

Adding to 20143191 its reverse (19134102), we get a palindrome (39277293).

The spelling of 20143191 in words is "twenty million, one hundred forty-three thousand, one hundred ninety-one".