18194920 has 32 divisors (see below), whose sum is σ = 41164200. Its totient is φ = 7237888.

The previous prime is 18194903. The next prime is 18194963. The reversal of 18194920 is 2949181.

It can be written as a sum of positive squares in 4 ways, for example, as 18164644 + 30276 = 4262^2 + 174^2 .

It is a super-2 number, since 2×18194920² = 662110227612800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6726 + ... + 9034.

Almost surely, 2^18194920 is an apocalyptic number.

18194920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18194920 is an abundant number, since it is smaller than the sum of its proper divisors (22969280).

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

18194920 is a wasteful number, since it uses less digits than its factorization.

18194920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517 (or 2513 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18194920 is about 4265.5503748051. The cubic root of 18194920 is about 263.0167357198.

The spelling of 18194920 in words is "eighteen million, one hundred ninety-four thousand, nine hundred twenty".