18074920 has 16 divisors (see below), whose sum is σ = 40668660. Its totient is φ = 7229952.

The previous prime is 18074899. The next prime is 18074923. The reversal of 18074920 is 2947081.

It can be written as a sum of positive squares in 2 ways, for example, as 16532356 + 1542564 = 4066^2 + 1242^2 .

It is not an unprimeable number, because it can be changed into a prime (18074923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225897 + ... + 225976.

Almost surely, 2^18074920 is an apocalyptic number.

18074920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18074920 is an abundant number, since it is smaller than the sum of its proper divisors (22593740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18074920 is a wasteful number, since it uses less digits than its factorization.

18074920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451884 (or 451880 counting only the distinct ones).

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

The square root of 18074920 is about 4251.4609253761. The cubic root of 18074920 is about 262.4372397202.

The spelling of 18074920 in words is "eighteen million, seventy-four thousand, nine hundred twenty".