20715189 has 8 divisors (see below), whose sum is σ = 30131232. Its totient is φ = 12554640.

The previous prime is 20715169. The next prime is 20715199. The reversal of 20715189 is 98151702.

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

It is not a de Polignac number, because 20715189 - 2⁸ = 20714933 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 627733 = 20715189 / (2 + 0 + 7 + 1 + 5 + 1 + 8 + 9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20715169) 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, 313834 + ... + 313899.

It is an arithmetic number, because the mean of its divisors is an integer number (3766404).

Almost surely, 2^20715189 is an apocalyptic number.

It is an amenable number.

20715189 is a deficient number, since it is larger than the sum of its proper divisors (9416043).

20715189 is a wasteful number, since it uses less digits than its factorization.

20715189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627747.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 20715189 is about 4551.3941820062. The cubic root of 20715189 is about 274.6394790841.

It can be divided in two parts, 2071 and 5189, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 20715189 in words is "twenty million, seven hundred fifteen thousand, one hundred eighty-nine".