20321143 has 4 divisors (see below), whose sum is σ = 20481280. Its totient is φ = 20161008.

The previous prime is 20321131. The next prime is 20321149. The reversal of 20321143 is 34112302.

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 20321143 - 2¹³ = 20312951 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 (20321149) 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, 79878 + ... + 80131.

It is an arithmetic number, because the mean of its divisors is an integer number (5120320).

Almost surely, 2^20321143 is an apocalyptic number.

20321143 is a deficient number, since it is larger than the sum of its proper divisors (160137).

20321143 is a wasteful number, since it uses less digits than its factorization.

20321143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160136.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20321143 is about 4507.8978471123. The cubic root of 20321143 is about 272.8869143903.

Adding to 20321143 its reverse (34112302), we get a palindrome (54433445).

It can be divided in two parts, 2032 and 1143, that multiplied together give a square (2322576 = 1524²).

The spelling of 20321143 in words is "twenty million, three hundred twenty-one thousand, one hundred forty-three".