20288839 has 4 divisors (see below), whose sum is σ = 20837224. Its totient is φ = 19740456.

The previous prime is 20288797. The next prime is 20288843. The reversal of 20288839 is 93888202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93888202 = 2 ⋅46944101.

It is a cyclic number.

It is not a de Polignac number, because 20288839 - 2⁷ = 20288711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20288899) 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, 274137 + ... + 274210.

It is an arithmetic number, because the mean of its divisors is an integer number (5209306).

Almost surely, 2^20288839 is an apocalyptic number.

20288839 is a deficient number, since it is larger than the sum of its proper divisors (548385).

20288839 is an equidigital number, since it uses as much as digits as its factorization.

20288839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548384.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 20288839 is about 4504.3133771975. The cubic root of 20288839 is about 272.7422372563.

The spelling of 20288839 in words is "twenty million, two hundred eighty-eight thousand, eight hundred thirty-nine".