20289147 has 4 divisors (see below), whose sum is σ = 27052200. Its totient is φ = 13526096.

The previous prime is 20289103. The next prime is 20289167. The reversal of 20289147 is 74198202.

It is a happy number.

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 20289147 - 2¹² = 20285051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20289167) 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, 3381522 + ... + 3381527.

It is an arithmetic number, because the mean of its divisors is an integer number (6763050).

Almost surely, 2^20289147 is an apocalyptic number.

20289147 is a deficient number, since it is larger than the sum of its proper divisors (6763053).

20289147 is an equidigital number, since it uses as much as digits as its factorization.

20289147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6763052.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20289147 is about 4504.3475665184. The cubic root of 20289147 is about 272.7436173942.

It can be divided in two parts, 2028 and 9147, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 20289147 in words is "twenty million, two hundred eighty-nine thousand, one hundred forty-seven".