18920435938 has 4 divisors (see below), whose sum is σ = 28380653910. Its totient is φ = 9460217968.

The previous prime is 18920435909. The next prime is 18920435951. The reversal of 18920435938 is 83953402981.

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., 17793692449 + 1126743489 = 133393^2 + 33567^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4730108983 + ... + 4730108986.

Almost surely, 2^18920435938 is an apocalyptic number.

18920435938 is a deficient number, since it is larger than the sum of its proper divisors (9460217972).

18920435938 is an equidigital number, since it uses as much as digits as its factorization.

18920435938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9460217971.

The product of its (nonzero) digits is 1866240, while the sum is 52.

It can be divided in two parts, 1892043 and 5938, that added together give a palindrome (1897981).

The spelling of 18920435938 in words is "eighteen billion, nine hundred twenty million, four hundred thirty-five thousand, nine hundred thirty-eight".