20827387 has 4 divisors (see below), whose sum is σ = 23802736. Its totient is φ = 17852040.

The previous prime is 20827349. The next prime is 20827403. The reversal of 20827387 is 78372802.

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

It is a cyclic number.

It is not a de Polignac number, because 20827387 - 2¹⁵ = 20794619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20827487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1487664 + ... + 1487677.

It is an arithmetic number, because the mean of its divisors is an integer number (5950684).

Almost surely, 2^20827387 is an apocalyptic number.

20827387 is a deficient number, since it is larger than the sum of its proper divisors (2975349).

20827387 is an equidigital number, since it uses as much as digits as its factorization.

20827387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975348.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 20827387 is about 4563.7032112091. The cubic root of 20827387 is about 275.1344224367.

The spelling of 20827387 in words is "twenty million, eight hundred twenty-seven thousand, three hundred eighty-seven".