20219189 has 2 divisors, whose sum is σ = 20219190. Its totient is φ = 20219188.

The previous prime is 20219183. The next prime is 20219197. The reversal of 20219189 is 98191202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13380964 + 6838225 = 3658^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 20219189 - 2¹² = 20215093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20219183) 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 as a sum of consecutive naturals, namely, 10109594 + 10109595.

It is an arithmetic number, because the mean of its divisors is an integer number (10109595).

Almost surely, 2^20219189 is an apocalyptic number.

It is an amenable number.

20219189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20219189 is an equidigital number, since it uses as much as digits as its factorization.

20219189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 20219189 is about 4496.5752523448. The cubic root of 20219189 is about 272.4297784999.

It can be divided in two parts, 202 and 19189, that added together give a palindrome (19391).

The spelling of 20219189 in words is "twenty million, two hundred nineteen thousand, one hundred eighty-nine".