20718019 has 8 divisors (see below), whose sum is σ = 25070688. Its totient is φ = 16713600.

The previous prime is 20718017. The next prime is 20718031. The reversal of 20718019 is 91081702.

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 20718019 - 2¹ = 20718017 is a prime.

It is a super-2 number, since 2×20718019² = 858472622568722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20718011) 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 7 ways as a sum of consecutive naturals, for example, 86932 + ... + 87169.

It is an arithmetic number, because the mean of its divisors is an integer number (3133836).

Almost surely, 2^20718019 is an apocalyptic number.

20718019 is a deficient number, since it is larger than the sum of its proper divisors (4352669).

20718019 is a wasteful number, since it uses less digits than its factorization.

20718019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174125.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20718019 is about 4551.7050651377. The cubic root of 20718019 is about 274.6519851143.

The spelling of 20718019 in words is "twenty million, seven hundred eighteen thousand, nineteen".