20620450042 has 8 divisors (see below), whose sum is σ = 30932274132. Its totient is φ = 10309692000.

The previous prime is 20620450001. The next prime is 20620450073. The reversal of 20620450042 is 24005402602.

It can be written as a sum of positive squares in 2 ways, for example, as 17253085201 + 3367364841 = 131351^2 + 58029^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20620449989 and 20620450016.

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 in 3 ways as a sum of consecutive naturals, for example, 216259 + ... + 296662.

Almost surely, 2^20620450042 is an apocalyptic number.

20620450042 is a deficient number, since it is larger than the sum of its proper divisors (10311824090).

20620450042 is a wasteful number, since it uses less digits than its factorization.

20620450042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533024.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 20620450042 its reverse (24005402602), we get a palindrome (44625852644).

The spelling of 20620450042 in words is "twenty billion, six hundred twenty million, four hundred fifty thousand, forty-two".