20811077 has 16 divisors (see below), whose sum is σ = 25349760. Its totient is φ = 16677888.

The previous prime is 20811041. The next prime is 20811079. The reversal of 20811077 is 77011802.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20811077 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 (20811079) 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 15 ways as a sum of consecutive naturals, for example, 20813 + ... + 21789.

It is an arithmetic number, because the mean of its divisors is an integer number (1584360).

Almost surely, 2^20811077 is an apocalyptic number.

It is an amenable number.

20811077 is a deficient number, since it is larger than the sum of its proper divisors (4538683).

20811077 is a wasteful number, since it uses less digits than its factorization.

20811077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 20811077 is about 4561.9159352184. The cubic root of 20811077 is about 275.0625841032.

Adding to 20811077 its reverse (77011802), we get a palindrome (97822879).

The spelling of 20811077 in words is "twenty million, eight hundred eleven thousand, seventy-seven".