20111431442 has 4 divisors (see below), whose sum is σ = 30167147166. Its totient is φ = 10055715720.

The previous prime is 20111431427. The next prime is 20111431469. The reversal of 20111431442 is 24413411102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16656225481 + 3455205961 = 129059^2 + 58781^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5027857859 + ... + 5027857862.

Almost surely, 2^20111431442 is an apocalyptic number.

20111431442 is a deficient number, since it is larger than the sum of its proper divisors (10055715724).

20111431442 is a wasteful number, since it uses less digits than its factorization.

20111431442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10055715723.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 20111431442 its reverse (24413411102), we get a palindrome (44524842544).

The spelling of 20111431442 in words is "twenty billion, one hundred eleven million, four hundred thirty-one thousand, four hundred forty-two".