20439196418 has 8 divisors (see below), whose sum is σ = 31487410812. Its totient is φ = 9943392816.

The previous prime is 20439196417. The next prime is 20439196511. The reversal of 20439196418 is 81469193402.

It can be written as a sum of positive squares in 2 ways, for example, as 15610753249 + 4828443169 = 124943^2 + 69487^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20439196417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138102605 + ... + 138102752.

Almost surely, 2^20439196418 is an apocalyptic number.

20439196418 is a deficient number, since it is larger than the sum of its proper divisors (11048214394).

20439196418 is a wasteful number, since it uses less digits than its factorization.

20439196418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276205396.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 20439196418 in words is "twenty billion, four hundred thirty-nine million, one hundred ninety-six thousand, four hundred eighteen".