20196409 has 2 divisors, whose sum is σ = 20196410. Its totient is φ = 20196408.

The previous prime is 20196389. The next prime is 20196427. The reversal of 20196409 is 90469102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19386409 + 810000 = 4403^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 20196409 - 2¹⁵ = 20163641 is a prime.

It is equal to p_1282297 and since 20196409 and 1282297 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20196439) 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, 10098204 + 10098205.

It is an arithmetic number, because the mean of its divisors is an integer number (10098205).

Almost surely, 2^20196409 is an apocalyptic number.

It is an amenable number.

20196409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20196409 is an equidigital number, since it uses as much as digits as its factorization.

20196409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20196409 is about 4494.0414995859. The cubic root of 20196409 is about 272.3274288217.

The spelling of 20196409 in words is "twenty million, one hundred ninety-six thousand, four hundred nine".