20196505 has 8 divisors (see below), whose sum is σ = 27698112. Its totient is φ = 13849008.

The previous prime is 20196443. The next prime is 20196509. The reversal of 20196505 is 50569102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20196505 - 2¹⁹ = 19672217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20196509) 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 7 ways as a sum of consecutive naturals, for example, 288487 + ... + 288556.

It is an arithmetic number, because the mean of its divisors is an integer number (3462264).

Almost surely, 2^20196505 is an apocalyptic number.

It is an amenable number.

20196505 is a deficient number, since it is larger than the sum of its proper divisors (7501607).

20196505 is an equidigital number, since it uses as much as digits as its factorization.

20196505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577055.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 20196505 is about 4494.0521803824. The cubic root of 20196505 is about 272.3278603075.

The spelling of 20196505 in words is "twenty million, one hundred ninety-six thousand, five hundred five".