20448797738 has 4 divisors (see below), whose sum is σ = 30673196610. Its totient is φ = 10224398868.

The previous prime is 20448797737. The next prime is 20448797821. The reversal of 20448797738 is 83779784402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83779784402 = 2 ⋅41889892201.

It can be written as a sum of positive squares in only one way, i.e., 18343180969 + 2105616769 = 135437^2 + 45887^2 .

It is not an unprimeable number, because it can be changed into a prime (20448797737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5112199433 + ... + 5112199436.

Almost surely, 2^20448797738 is an apocalyptic number.

20448797738 is a deficient number, since it is larger than the sum of its proper divisors (10224398872).

20448797738 is a wasteful number, since it uses less digits than its factorization.

20448797738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10224398871.

The product of its (nonzero) digits is 18966528, while the sum is 59.

The spelling of 20448797738 in words is "twenty billion, four hundred forty-eight million, seven hundred ninety-seven thousand, seven hundred thirty-eight".