20196109 has 2 divisors, whose sum is σ = 20196110. Its totient is φ = 20196108.

The previous prime is 20196101. The next prime is 20196173. The reversal of 20196109 is 90169102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18748900 + 1447209 = 4330^2 + 1203^2 .

It is a cyclic number.

It is not a de Polignac number, because 20196109 - 2³ = 20196101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20196101) 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, 10098054 + 10098055.

It is an arithmetic number, because the mean of its divisors is an integer number (10098055).

Almost surely, 2^20196109 is an apocalyptic number.

It is an amenable number.

20196109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20196109 is an equidigital number, since it uses as much as digits as its factorization.

20196109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 20196109 is about 4494.0081219330. The cubic root of 20196109 is about 272.3260804197.

It can be divided in two parts, 2019 and 6109, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 20196109 in words is "twenty million, one hundred ninety-six thousand, one hundred nine".