20266189 has 4 divisors (see below), whose sum is σ = 20277756. Its totient is φ = 20254624.

The previous prime is 20266171. The next prime is 20266199. The reversal of 20266189 is 98166202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12482089 + 7784100 = 3533^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 20266189 - 2¹¹ = 20264141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266109) 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, 2554 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (5069439).

Almost surely, 2^20266189 is an apocalyptic number.

It is an amenable number.

20266189 is a deficient number, since it is larger than the sum of its proper divisors (11567).

20266189 is an equidigital number, since it uses as much as digits as its factorization.

20266189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11566.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20266189 is about 4501.7984184101. The cubic root of 20266189 is about 272.6407050469.

The spelling of 20266189 in words is "twenty million, two hundred sixty-six thousand, one hundred eighty-nine".