20219109 has 16 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 12995840.

The previous prime is 20219107. The next prime is 20219141. The reversal of 20219109 is 90191202.

It is a cyclic number.

It is not a de Polignac number, because 20219109 - 2¹ = 20219107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20219107) 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 in 15 ways as a sum of consecutive naturals, for example, 10024 + ... + 11870.

It is an arithmetic number, because the mean of its divisors is an integer number (1746360).

Almost surely, 2^20219109 is an apocalyptic number.

It is an amenable number.

20219109 is a deficient number, since it is larger than the sum of its proper divisors (7722651).

20219109 is a wasteful number, since it uses less digits than its factorization.

20219109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 20219109 is about 4496.5663566771. The cubic root of 20219109 is about 272.4294191975.

The spelling of 20219109 in words is "twenty million, two hundred nineteen thousand, one hundred nine".