20916319 has 4 divisors (see below), whose sum is σ = 20928160. Its totient is φ = 20904480.

The previous prime is 20916317. The next prime is 20916331. The reversal of 20916319 is 91361902.

It is a semiprime because it is the product of two primes, 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 20916319 - 2¹ = 20916317 is a prime.

It is a super-2 number, since 2×20916319² = 874984801019522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2679 + ... + 7000.

It is an arithmetic number, because the mean of its divisors is an integer number (5232040).

Almost surely, 2^20916319 is an apocalyptic number.

20916319 is a deficient number, since it is larger than the sum of its proper divisors (11841).

20916319 is an equidigital number, since it uses as much as digits as its factorization.

20916319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11840.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 20916319 is about 4573.4362354798. The cubic root of 20916319 is about 275.5254702227.

The spelling of 20916319 in words is "twenty million, nine hundred sixteen thousand, three hundred nineteen".