20818065 has 8 divisors (see below), whose sum is σ = 33308928. Its totient is φ = 11102960.

The previous prime is 20818009. The next prime is 20818073. The reversal of 20818065 is 56081802.

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

It is not a de Polignac number, because 20818065 - 2¹⁴ = 20801681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693921 + ... + 693950.

It is an arithmetic number, because the mean of its divisors is an integer number (4163616).

Almost surely, 2^20818065 is an apocalyptic number.

It is an amenable number.

20818065 is a deficient number, since it is larger than the sum of its proper divisors (12490863).

20818065 is a wasteful number, since it uses less digits than its factorization.

20818065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387879.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 20818065 is about 4562.6817772008. The cubic root of 20818065 is about 275.0933677453.

Adding to 20818065 its reverse (56081802), we get a palindrome (76899867).

The spelling of 20818065 in words is "twenty million, eight hundred eighteen thousand, sixty-five".