20385243 has 8 divisors (see below), whose sum is σ = 30200400. Its totient is φ = 13590144.

The previous prime is 20385223. The next prime is 20385247. The reversal of 20385243 is 34258302.

It is not a de Polignac number, because 20385243 - 2⁶ = 20385179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 755009 = 20385243 / (2 + 0 + 3 + 8 + 5 + 2 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (20385247) 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, 377478 + ... + 377531.

It is an arithmetic number, because the mean of its divisors is an integer number (3775050).

Almost surely, 2^20385243 is an apocalyptic number.

20385243 is a deficient number, since it is larger than the sum of its proper divisors (9815157).

20385243 is an equidigital number, since it uses as much as digits as its factorization.

20385243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755018 (or 755012 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20385243 is about 4515.0019933550. The cubic root of 20385243 is about 273.1735401862.

The spelling of 20385243 in words is "twenty million, three hundred eighty-five thousand, two hundred forty-three".