20612311 has 4 divisors (see below), whose sum is σ = 20844000. Its totient is φ = 20380624.

The previous prime is 20612269. The next prime is 20612341. The reversal of 20612311 is 11321602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11321602 = 2 ⋅5660801.

It is a cyclic number.

It is not a de Polignac number, because 20612311 - 2⁷ = 20612183 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 (20612341) 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 3 ways as a sum of consecutive naturals, for example, 115711 + ... + 115888.

It is an arithmetic number, because the mean of its divisors is an integer number (5211000).

Almost surely, 2^20612311 is an apocalyptic number.

20612311 is a deficient number, since it is larger than the sum of its proper divisors (231689).

20612311 is an equidigital number, since it uses as much as digits as its factorization.

20612311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231688.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20612311 is about 4540.0783032895. The cubic root of 20612311 is about 274.1840763184.

Adding to 20612311 its reverse (11321602), we get a palindrome (31933913).

The spelling of 20612311 in words is "twenty million, six hundred twelve thousand, three hundred eleven".