20001243431 has 8 divisors (see below), whose sum is σ = 22234633344. Its totient is φ = 17867115360.

The previous prime is 20001243391. The next prime is 20001243473. The reversal of 20001243431 is 13434210002.

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

It is a de Polignac number, because none of the positive numbers 2^k-20001243431 is a prime.

It is a super-2 number, since 2×20001243431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001243491) 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, 24815036 + ... + 24815841.

It is an arithmetic number, because the mean of its divisors is an integer number (2779329168).

Almost surely, 2^20001243431 is an apocalyptic number.

20001243431 is a deficient number, since it is larger than the sum of its proper divisors (2233389913).

20001243431 is a wasteful number, since it uses less digits than its factorization.

20001243431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49630921.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20001243431 its reverse (13434210002), we get a palindrome (33435453433).

The spelling of 20001243431 in words is "twenty billion, one million, two hundred forty-three thousand, four hundred thirty-one".