20516061 has 4 divisors (see below), whose sum is σ = 27354752. Its totient is φ = 13677372.

The previous prime is 20516057. The next prime is 20516071. The reversal of 20516061 is 16061502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20516061 - 2² = 20516057 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 (20516071) by changing a digit.

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, 3419341 + ... + 3419346.

It is an arithmetic number, because the mean of its divisors is an integer number (6838688).

Almost surely, 2^20516061 is an apocalyptic number.

It is an amenable number.

20516061 is a deficient number, since it is larger than the sum of its proper divisors (6838691).

20516061 is an equidigital number, since it uses as much as digits as its factorization.

20516061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838690.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20516061 is about 4529.4658625494. The cubic root of 20516061 is about 273.7566391918.

Adding to 20516061 its reverse (16061502), we get a palindrome (36577563).

The spelling of 20516061 in words is "twenty million, five hundred sixteen thousand, sixty-one".