20173749938 has 4 divisors (see below), whose sum is σ = 30260624910. Its totient is φ = 10086874968.

The previous prime is 20173749929. The next prime is 20173749983. The reversal of 20173749938 is 83994737102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19045932049 + 1127817889 = 138007^2 + 33583^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20173749938.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5043437483 + ... + 5043437486.

Almost surely, 2^20173749938 is an apocalyptic number.

20173749938 is a deficient number, since it is larger than the sum of its proper divisors (10086874972).

20173749938 is a wasteful number, since it uses less digits than its factorization.

20173749938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10086874971.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 20173749938 in words is "twenty billion, one hundred seventy-three million, seven hundred forty-nine thousand, nine hundred thirty-eight".