20308143 has 8 divisors (see below), whose sum is σ = 27108400. Its totient is φ = 13523328.

The previous prime is 20308129. The next prime is 20308157. The reversal of 20308143 is 34180302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20308129) and next prime (20308157).

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

It is not a de Polignac number, because 20308143 - 2⁵ = 20308111 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 (20308543) 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, 328 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (3388550).

Almost surely, 2^20308143 is an apocalyptic number.

20308143 is a deficient number, since it is larger than the sum of its proper divisors (6800257).

20308143 is a wasteful number, since it uses less digits than its factorization.

20308143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7721.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20308143 is about 4506.4557026559. The cubic root of 20308143 is about 272.8287108624.

Adding to 20308143 its reverse (34180302), we get a palindrome (54488445).

The spelling of 20308143 in words is "twenty million, three hundred eight thousand, one hundred forty-three".