20816719 has 18 divisors (see below), whose sum is σ = 26624472. Its totient is φ = 16216200.

The previous prime is 20816701. The next prime is 20816759. The reversal of 20816719 is 91761802.

It is a happy number.

It is not a de Polignac number, because 20816719 - 2⁹ = 20816207 is a prime.

It is a super-2 number, since 2×20816719² = 866671579849922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816759) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4174 + ... + 7684.

Almost surely, 2^20816719 is an apocalyptic number.

20816719 is a deficient number, since it is larger than the sum of its proper divisors (5807753).

20816719 is a wasteful number, since it uses less digits than its factorization.

20816719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547 (or 3529 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 20816719 is about 4562.5342738439. The cubic root of 20816719 is about 275.0874388617.

The spelling of 20816719 in words is "twenty million, eight hundred sixteen thousand, seven hundred nineteen".