20513197 has 8 divisors (see below), whose sum is σ = 21048192. Its totient is φ = 19982400.

The previous prime is 20513191. The next prime is 20513231. The reversal of 20513197 is 79131502.

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 20513197 - 2⁷ = 20513069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513191) 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, 10422 + ... + 12232.

It is an arithmetic number, because the mean of its divisors is an integer number (2631024).

Almost surely, 2^20513197 is an apocalyptic number.

It is an amenable number.

20513197 is a deficient number, since it is larger than the sum of its proper divisors (534995).

20513197 is a wasteful number, since it uses less digits than its factorization.

20513197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 20513197 is about 4529.1496994469. The cubic root of 20513197 is about 273.7438999774.

Adding to 20513197 its reverse (79131502), we get a palindrome (99644699).

The spelling of 20513197 in words is "twenty million, five hundred thirteen thousand, one hundred ninety-seven".