20806075 has 12 divisors (see below), whose sum is σ = 26000568. Its totient is φ = 16515200.

The previous prime is 20806073. The next prime is 20806081. The reversal of 20806075 is 57060802.

It is not a de Polignac number, because 20806075 - 2¹ = 20806073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20806073) 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 11 ways as a sum of consecutive naturals, for example, 99 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (2166714).

Almost surely, 2^20806075 is an apocalyptic number.

20806075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20806075 is a deficient number, since it is larger than the sum of its proper divisors (5194493).

20806075 is a wasteful number, since it uses less digits than its factorization.

20806075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6494 (or 6489 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20806075 is about 4561.3676677067. The cubic root of 20806075 is about 275.0405449861.

Adding to 20806075 its reverse (57060802), we get a palindrome (77866877).

The spelling of 20806075 in words is "twenty million, eight hundred six thousand, seventy-five".