20605401338 has 8 divisors (see below), whose sum is σ = 30965235060. Its totient is φ = 10283656320.

The previous prime is 20605401331. The next prime is 20605401359. The reversal of 20605401338 is 83310450602.

It can be written as a sum of positive squares in 2 ways, for example, as 19945065529 + 660335809 = 141227^2 + 25697^2 .

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 (20605401331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9520823 + ... + 9522986.

Almost surely, 2^20605401338 is an apocalyptic number.

20605401338 is a deficient number, since it is larger than the sum of its proper divisors (10359833722).

20605401338 is a wasteful number, since it uses less digits than its factorization.

20605401338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19044352.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 20605401338 in words is "twenty billion, six hundred five million, four hundred one thousand, three hundred thirty-eight".