20288019 has 4 divisors (see below), whose sum is σ = 27050696. Its totient is φ = 13525344.

The previous prime is 20288017. The next prime is 20288027. The reversal of 20288019 is 91088202.

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

It is not a de Polignac number, because 20288019 - 2¹ = 20288017 is a prime.

It is a super-2 number, since 2×20288019² = 823207429888722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3381334 + ... + 3381339.

It is an arithmetic number, because the mean of its divisors is an integer number (6762674).

Almost surely, 2^20288019 is an apocalyptic number.

20288019 is a deficient number, since it is larger than the sum of its proper divisors (6762677).

20288019 is an equidigital number, since it uses as much as digits as its factorization.

20288019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6762676.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 20288019 is about 4504.2223524156. Note that the first 3 decimals coincide. The cubic root of 20288019 is about 272.7385627952.

The spelling of 20288019 in words is "twenty million, two hundred eighty-eight thousand, nineteen".