20416553 has 4 divisors (see below), whose sum is σ = 20427600. Its totient is φ = 20405508.

The previous prime is 20416549. The next prime is 20416597. The reversal of 20416553 is 35561402.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20416553 - 2² = 20416549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20416453) 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 3 ways as a sum of consecutive naturals, for example, 2003 + ... + 6696.

It is an arithmetic number, because the mean of its divisors is an integer number (5106900).

Almost surely, 2^20416553 is an apocalyptic number.

It is an amenable number.

20416553 is a deficient number, since it is larger than the sum of its proper divisors (11047).

20416553 is an equidigital number, since it uses as much as digits as its factorization.

20416553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11046.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20416553 is about 4518.4679925833. The cubic root of 20416553 is about 273.3133257548.

Adding to 20416553 its reverse (35561402), we get a palindrome (55977955).

The spelling of 20416553 in words is "twenty million, four hundred sixteen thousand, five hundred fifty-three".