20733819 has 4 divisors (see below), whose sum is σ = 27645096. Its totient is φ = 13822544.

The previous prime is 20733799. The next prime is 20733821. The reversal of 20733819 is 91833702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20733819 - 2⁸ = 20733563 is a prime.

It is a super-2 number, since 2×20733819² = 859782500649522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20733819.

It is not an unprimeable number, because it can be changed into a prime (20733719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455634 + ... + 3455639.

It is an arithmetic number, because the mean of its divisors is an integer number (6911274).

Almost surely, 2^20733819 is an apocalyptic number.

20733819 is a deficient number, since it is larger than the sum of its proper divisors (6911277).

20733819 is an equidigital number, since it uses as much as digits as its factorization.

20733819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911276.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20733819 is about 4553.4403476932. The cubic root of 20733819 is about 274.7217858467.

The spelling of 20733819 in words is "twenty million, seven hundred thirty-three thousand, eight hundred nineteen".