20001431542 has 4 divisors (see below), whose sum is σ = 30002147316. Its totient is φ = 10000715770.

The previous prime is 20001431519. The next prime is 20001431561. The reversal of 20001431542 is 24513410002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24513410002 = 2 ⋅12256705001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000357884 + ... + 5000357887.

It is an arithmetic number, because the mean of its divisors is an integer number (7500536829).

Almost surely, 2^20001431542 is an apocalyptic number.

20001431542 is a deficient number, since it is larger than the sum of its proper divisors (10000715774).

20001431542 is a wasteful number, since it uses less digits than its factorization.

20001431542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000715773.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20001431542 its reverse (24513410002), we get a palindrome (44514841544).

The spelling of 20001431542 in words is "twenty billion, one million, four hundred thirty-one thousand, five hundred forty-two".