20384247 has 8 divisors (see below), whose sum is σ = 29269744. Its totient is φ = 12544128.

The previous prime is 20384239. The next prime is 20384251. The reversal of 20384247 is 74248302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20384247 - 2³ = 20384239 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 (20384227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261298 + ... + 261375.

It is an arithmetic number, because the mean of its divisors is an integer number (3658718).

Almost surely, 2^20384247 is an apocalyptic number.

20384247 is a deficient number, since it is larger than the sum of its proper divisors (8885497).

20384247 is a wasteful number, since it uses less digits than its factorization.

20384247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522689.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 20384247 is about 4514.8916930531. The cubic root of 20384247 is about 273.1690911300.

The spelling of 20384247 in words is "twenty million, three hundred eighty-four thousand, two hundred forty-seven".