20516495 has 4 divisors (see below), whose sum is σ = 24619800. Its totient is φ = 16413192.

The previous prime is 20516473. The next prime is 20516519. The reversal of 20516495 is 59461502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20516495 - 2⁸ = 20516239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051645 + ... + 2051654.

It is an arithmetic number, because the mean of its divisors is an integer number (6154950).

Almost surely, 2^20516495 is an apocalyptic number.

20516495 is a deficient number, since it is larger than the sum of its proper divisors (4103305).

20516495 is an equidigital number, since it uses as much as digits as its factorization.

20516495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4103304.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 20516495 is about 4529.5137708147. The cubic root of 20516495 is about 273.7585695419.

Adding to 20516495 its reverse (59461502), we get a palindrome (79977997).

The spelling of 20516495 in words is "twenty million, five hundred sixteen thousand, four hundred ninety-five".