20257447 has 8 divisors (see below), whose sum is σ = 23329152. Its totient is φ = 17230200.

The previous prime is 20257373. The next prime is 20257451. The reversal of 20257447 is 74475202.

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

It is a cyclic number.

It is not a de Polignac number, because 20257447 - 2¹¹ = 20255399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20257247) 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 7 ways as a sum of consecutive naturals, for example, 10129 + ... + 11962.

It is an arithmetic number, because the mean of its divisors is an integer number (2916144).

Almost surely, 2^20257447 is an apocalyptic number.

20257447 is a deficient number, since it is larger than the sum of its proper divisors (3071705).

20257447 is a wasteful number, since it uses less digits than its factorization.

20257447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22229.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 20257447 is about 4500.8273683846. The cubic root of 20257447 is about 272.6014974151.

The spelling of 20257447 in words is "twenty million, two hundred fifty-seven thousand, four hundred forty-seven".