20189569 has 4 divisors (see below), whose sum is σ = 20261700. Its totient is φ = 20117440.

The previous prime is 20189567. The next prime is 20189573. The reversal of 20189569 is 96598102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18173169 + 2016400 = 4263^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 20189569 - 2¹ = 20189567 is a prime.

It is a super-2 number, since 2×20189569² = 815237392811522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20189567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35644 + ... + 36205.

It is an arithmetic number, because the mean of its divisors is an integer number (5065425).

Almost surely, 2^20189569 is an apocalyptic number.

It is an amenable number.

20189569 is a deficient number, since it is larger than the sum of its proper divisors (72131).

20189569 is an equidigital number, since it uses as much as digits as its factorization.

20189569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72130.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 20189569 is about 4493.2804274828. The cubic root of 20189569 is about 272.2966819377.

The spelling of 20189569 in words is "twenty million, one hundred eighty-nine thousand, five hundred sixty-nine".