20439196394 has 4 divisors (see below), whose sum is σ = 30658794594. Its totient is φ = 10219598196.

The previous prime is 20439196387. The next prime is 20439196417. The reversal of 20439196394 is 49369193402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49369193402 = 2 ⋅24684596701.

It can be written as a sum of positive squares in only one way, i.e., 18424533169 + 2014663225 = 135737^2 + 44885^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109799097 + ... + 5109799100.

Almost surely, 2^20439196394 is an apocalyptic number.

20439196394 is a deficient number, since it is larger than the sum of its proper divisors (10219598200).

20439196394 is a wasteful number, since it uses less digits than its factorization.

20439196394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10219598199.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 20439196394 in words is "twenty billion, four hundred thirty-nine million, one hundred ninety-six thousand, three hundred ninety-four".