20616799 has 12 divisors (see below), whose sum is σ = 24178944. Its totient is φ = 17527104.

The previous prime is 20616781. The next prime is 20616803. The reversal of 20616799 is 99761602.

It is a de Polignac number, because none of the positive numbers 2^k-20616799 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 (20616749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4567 + ... + 7879.

It is an arithmetic number, because the mean of its divisors is an integer number (2014912).

Almost surely, 2^20616799 is an apocalyptic number.

20616799 is a deficient number, since it is larger than the sum of its proper divisors (3562145).

20616799 is a wasteful number, since it uses less digits than its factorization.

20616799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454 (or 3447 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 20616799 is about 4540.5725409908. The cubic root of 20616799 is about 274.2039746021.

The spelling of 20616799 in words is "twenty million, six hundred sixteen thousand, seven hundred ninety-nine".