20288513 has 4 divisors (see below), whose sum is σ = 23186880. Its totient is φ = 17390148.

The previous prime is 20288509. The next prime is 20288519. The reversal of 20288513 is 31588202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20288513 - 2² = 20288509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288519) 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, 1449173 + ... + 1449186.

It is an arithmetic number, because the mean of its divisors is an integer number (5796720).

Almost surely, 2^20288513 is an apocalyptic number.

It is an amenable number.

20288513 is a deficient number, since it is larger than the sum of its proper divisors (2898367).

20288513 is an equidigital number, since it uses as much as digits as its factorization.

20288513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898366.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20288513 is about 4504.2771895166. The cubic root of 20288513 is about 272.7407764458.

The spelling of 20288513 in words is "twenty million, two hundred eighty-eight thousand, five hundred thirteen".