20385047 has 4 divisors (see below), whose sum is σ = 20407920. Its totient is φ = 20362176.

The previous prime is 20384977. The next prime is 20385059. The reversal of 20385047 is 74058302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74058302 = 2 ⋅37029151.

It is a cyclic number.

It is not a de Polignac number, because 20385047 - 2¹² = 20380951 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 (20385067) 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, 10043 + ... + 11900.

It is an arithmetic number, because the mean of its divisors is an integer number (5101980).

Almost surely, 2^20385047 is an apocalyptic number.

20385047 is a deficient number, since it is larger than the sum of its proper divisors (22873).

20385047 is an equidigital number, since it uses as much as digits as its factorization.

20385047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22872.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20385047 is about 4514.9802878861. The cubic root of 20385047 is about 273.1726646805.

The spelling of 20385047 in words is "twenty million, three hundred eighty-five thousand, forty-seven".