20149239 has 8 divisors (see below), whose sum is σ = 29308032. Its totient is φ = 12211640.

The previous prime is 20149237. The next prime is 20149243. The reversal of 20149239 is 93294102.

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 20149239 - 2¹ = 20149237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20149237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305259 + ... + 305324.

It is an arithmetic number, because the mean of its divisors is an integer number (3663504).

Almost surely, 2^20149239 is an apocalyptic number.

20149239 is a deficient number, since it is larger than the sum of its proper divisors (9158793).

20149239 is a wasteful number, since it uses less digits than its factorization.

20149239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610597.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20149239 is about 4488.7903715812. The cubic root of 20149239 is about 272.1152508639.

The spelling of 20149239 in words is "twenty million, one hundred forty-nine thousand, two hundred thirty-nine".