20862005 has 8 divisors (see below), whose sum is σ = 25062072. Its totient is φ = 16671168.

The previous prime is 20861999. The next prime is 20862007. The reversal of 20862005 is 50026802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10666756 + 10195249 = 3266^2 + 3193^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20862005 - 2¹² = 20857909 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 (20862007) 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 7 ways as a sum of consecutive naturals, for example, 4499 + ... + 7871.

It is an arithmetic number, because the mean of its divisors is an integer number (3132759).

Almost surely, 2^20862005 is an apocalyptic number.

It is an amenable number.

20862005 is a deficient number, since it is larger than the sum of its proper divisors (4200067).

20862005 is a wasteful number, since it uses less digits than its factorization.

20862005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20862005 is about 4567.4943897065. The cubic root of 20862005 is about 275.2867752216.

Adding to 20862005 its reverse (50026802), we get a palindrome (70888807).

The spelling of 20862005 in words is "twenty million, eight hundred sixty-two thousand, five".