20744538338 has 4 divisors (see below), whose sum is σ = 31116807510. Its totient is φ = 10372269168.

The previous prime is 20744538317. The next prime is 20744538349. The reversal of 20744538338 is 83383544702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83383544702 = 2 ⋅41691772351.

It can be written as a sum of positive squares in only one way, i.e., 19870567369 + 873970969 = 140963^2 + 29563^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20744538292 and 20744538301.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5186134583 + ... + 5186134586.

Almost surely, 2^20744538338 is an apocalyptic number.

20744538338 is a deficient number, since it is larger than the sum of its proper divisors (10372269172).

20744538338 is a wasteful number, since it uses less digits than its factorization.

20744538338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10372269171.

The product of its (nonzero) digits is 1935360, while the sum is 47.

The spelling of 20744538338 in words is "twenty billion, seven hundred forty-four million, five hundred thirty-eight thousand, three hundred thirty-eight".