20385749 has 4 divisors (see below), whose sum is σ = 20441664. Its totient is φ = 20329836.

The previous prime is 20385731. The next prime is 20385763. The reversal of 20385749 is 94758302.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94758302 = 2 ⋅47379151.

It is a cyclic number.

It is not a de Polignac number, because 20385749 - 2⁸ = 20385493 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 (20385719) 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, 27407 + ... + 28140.

It is an arithmetic number, because the mean of its divisors is an integer number (5110416).

Almost surely, 2^20385749 is an apocalyptic number.

It is an amenable number.

20385749 is a deficient number, since it is larger than the sum of its proper divisors (55915).

20385749 is an equidigital number, since it uses as much as digits as its factorization.

20385749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55914.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20385749 is about 4515.0580284200. The cubic root of 20385749 is about 273.1758003942.

The spelling of 20385749 in words is "twenty million, three hundred eighty-five thousand, seven hundred forty-nine".