20386249 has 4 divisors (see below), whose sum is σ = 21954436. Its totient is φ = 18818064.

The previous prime is 20386243. The next prime is 20386253. The reversal of 20386249 is 94268302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2913849 + 17472400 = 1707^2 + 4180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20386249 - 2³ = 20386241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20386241) 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, 784074 + ... + 784099.

It is an arithmetic number, because the mean of its divisors is an integer number (5488609).

Almost surely, 2^20386249 is an apocalyptic number.

It is an amenable number.

20386249 is a deficient number, since it is larger than the sum of its proper divisors (1568187).

20386249 is a wasteful number, since it uses less digits than its factorization.

20386249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568186.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20386249 is about 4515.1133983545. The cubic root of 20386249 is about 273.1780337646.

The spelling of 20386249 in words is "twenty million, three hundred eighty-six thousand, two hundred forty-nine".