20356189 has 4 divisors (see below), whose sum is σ = 23264224. Its totient is φ = 17448156.

The previous prime is 20356183. The next prime is 20356211. The reversal of 20356189 is 98165302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20356189 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 (20356183) 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, 1454007 + ... + 1454020.

It is an arithmetic number, because the mean of its divisors is an integer number (5816056).

Almost surely, 2^20356189 is an apocalyptic number.

It is an amenable number.

20356189 is a deficient number, since it is larger than the sum of its proper divisors (2908035).

20356189 is an equidigital number, since it uses as much as digits as its factorization.

20356189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908034.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20356189 is about 4511.7833502951. The cubic root of 20356189 is about 273.0436985870.

The spelling of 20356189 in words is "twenty million, three hundred fifty-six thousand, one hundred eighty-nine".