20406504242 has 8 divisors (see below), whose sum is σ = 31029068316. Its totient is φ = 10063481472.

The previous prime is 20406504197. The next prime is 20406504253. The reversal of 20406504242 is 24240560402.

It can be written as a sum of positive squares in 2 ways, for example, as 17614332961 + 2792171281 = 132719^2 + 52841^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69885143 + ... + 69885434.

Almost surely, 2^20406504242 is an apocalyptic number.

20406504242 is a deficient number, since it is larger than the sum of its proper divisors (10622564074).

20406504242 is a wasteful number, since it uses less digits than its factorization.

20406504242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139770652.

The product of its (nonzero) digits is 15360, while the sum is 29.

The spelling of 20406504242 in words is "twenty billion, four hundred six million, five hundred four thousand, two hundred forty-two".