20768019 has 4 divisors (see below), whose sum is σ = 27690696. Its totient is φ = 13845344.

The previous prime is 20768009. The next prime is 20768021. The reversal of 20768019 is 91086702.

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 20768019 - 2⁹ = 20767507 is a prime.

It is a super-2 number, since 2×20768019² = 862621226368722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20768009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461334 + ... + 3461339.

It is an arithmetic number, because the mean of its divisors is an integer number (6922674).

Almost surely, 2^20768019 is an apocalyptic number.

20768019 is a deficient number, since it is larger than the sum of its proper divisors (6922677).

20768019 is an equidigital number, since it uses as much as digits as its factorization.

20768019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6922676.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20768019 is about 4557.1942025768. The cubic root of 20768019 is about 274.8727521483.

The spelling of 20768019 in words is "twenty million, seven hundred sixty-eight thousand, nineteen".