20424242042 has 4 divisors (see below), whose sum is σ = 30636363066. Its totient is φ = 10212121020.

The previous prime is 20424242009. The next prime is 20424242053. The reversal of 20424242042 is 24024242402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24024242402 = 2 ⋅12012121201.

It can be written as a sum of positive squares in only one way, i.e., 16726507561 + 3697734481 = 129331^2 + 60809^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106060509 + ... + 5106060512.

Almost surely, 2^20424242042 is an apocalyptic number.

20424242042 is a deficient number, since it is larger than the sum of its proper divisors (10212121024).

20424242042 is a wasteful number, since it uses less digits than its factorization.

20424242042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10212121023.

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20424242042 its reverse (24024242402), we get a palindrome (44448484444).

The spelling of 20424242042 in words is "twenty billion, four hundred twenty-four million, two hundred forty-two thousand, forty-two".