20606351242 has 4 divisors (see below), whose sum is σ = 30909526866. Its totient is φ = 10303175620.

The previous prime is 20606351239. The next prime is 20606351243. The reversal of 20606351242 is 24215360602.

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., 18534371881 + 2071979361 = 136141^2 + 45519^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20606351243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5151587809 + ... + 5151587812.

Almost surely, 2^20606351242 is an apocalyptic number.

20606351242 is a deficient number, since it is larger than the sum of its proper divisors (10303175624).

20606351242 is a wasteful number, since it uses less digits than its factorization.

20606351242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10303175623.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 20606351242 in words is "twenty billion, six hundred six million, three hundred fifty-one thousand, two hundred forty-two".