20001431543 has 8 divisors (see below), whose sum is σ = 20334582912. Its totient is φ = 19669298616.

The previous prime is 20001431519. The next prime is 20001431561. The reversal of 20001431543 is 34513410002.

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

It is a cyclic number.

It is not a de Polignac number, because 20001431543 - 2⁶ = 20001431479 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 (20001431743) 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, 214955 + ... + 293612.

It is an arithmetic number, because the mean of its divisors is an integer number (2541822864).

Almost surely, 2^20001431543 is an apocalyptic number.

20001431543 is a deficient number, since it is larger than the sum of its proper divisors (333151369).

20001431543 is an equidigital number, since it uses as much as digits as its factorization.

20001431543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509221.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20001431543 its reverse (34513410002), we get a palindrome (54514841545).

The spelling of 20001431543 in words is "twenty billion, one million, four hundred thirty-one thousand, five hundred forty-three".