20154189 has 8 divisors (see below), whose sum is σ = 29315232. Its totient is φ = 12214640.

The previous prime is 20154181. The next prime is 20154191. The reversal of 20154189 is 98145102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20154189 - 2³ = 20154181 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305334 + ... + 305399.

It is an arithmetic number, because the mean of its divisors is an integer number (3664404).

Almost surely, 2^20154189 is an apocalyptic number.

It is an amenable number.

20154189 is a deficient number, since it is larger than the sum of its proper divisors (9161043).

20154189 is a wasteful number, since it uses less digits than its factorization.

20154189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610747.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 20154189 is about 4489.3417112089. The cubic root of 20154189 is about 272.1375322712.

The spelling of 20154189 in words is "twenty million, one hundred fifty-four thousand, one hundred eighty-nine".