20185019 has 8 divisors (see below), whose sum is σ = 20571600. Its totient is φ = 19802016.

The previous prime is 20185003. The next prime is 20185031. The reversal of 20185019 is 91058102.

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 20185019 - 2⁴ = 20185003 is a prime.

It is a super-2 number, since 2×20185019² = 814869984060722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20185519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12257 + ... + 13805.

It is an arithmetic number, because the mean of its divisors is an integer number (2571450).

Almost surely, 2^20185019 is an apocalyptic number.

20185019 is a deficient number, since it is larger than the sum of its proper divisors (386581).

20185019 is a wasteful number, since it uses less digits than its factorization.

20185019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 20185019 is about 4492.7740873540. The cubic root of 20185019 is about 272.2762251201.

The spelling of 20185019 in words is "twenty million, one hundred eighty-five thousand, nineteen".