18920074 has 4 divisors (see below), whose sum is σ = 28380114. Its totient is φ = 9460036.

The previous prime is 18920071. The next prime is 18920089. The reversal of 18920074 is 47002981.

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., 17164449 + 1755625 = 4143^2 + 1325^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18920071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4730017 + ... + 4730020.

Almost surely, 2^18920074 is an apocalyptic number.

18920074 is a deficient number, since it is larger than the sum of its proper divisors (9460040).

18920074 is an equidigital number, since it uses as much as digits as its factorization.

18920074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9460039.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18920074 is about 4349.7211404871. The cubic root of 18920074 is about 266.4654728950.

The spelling of 18920074 in words is "eighteen million, nine hundred twenty thousand, seventy-four".