20002240042 has 4 divisors (see below), whose sum is σ = 30003360066. Its totient is φ = 10001120020.

The previous prime is 20002239991. The next prime is 20002240051. The reversal of 20002240042 is 24004220002.

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., 16934077161 + 3068162881 = 130131^2 + 55391^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20002239998 and 20002240025.

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, 5000560009 + ... + 5000560012.

Almost surely, 2^20002240042 is an apocalyptic number.

20002240042 is a deficient number, since it is larger than the sum of its proper divisors (10001120024).

20002240042 is a wasteful number, since it uses less digits than its factorization.

20002240042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10001120023.

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 20002240042 its reverse (24004220002), we get a palindrome (44006460044).

The spelling of 20002240042 in words is "twenty billion, two million, two hundred forty thousand, forty-two".