20057311 has 4 divisors (see below), whose sum is σ = 20929392. Its totient is φ = 19185232.

The previous prime is 20057291. The next prime is 20057347. The reversal of 20057311 is 11375002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11375002 = 2 ⋅5687501.

It is a cyclic number.

It is not a de Polignac number, because 20057311 - 2¹¹ = 20055263 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 (20057351) 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, 436006 + ... + 436051.

It is an arithmetic number, because the mean of its divisors is an integer number (5232348).

Almost surely, 2^20057311 is an apocalyptic number.

20057311 is a deficient number, since it is larger than the sum of its proper divisors (872081).

20057311 is an equidigital number, since it uses as much as digits as its factorization.

20057311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872080.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20057311 is about 4478.5389358584. The cubic root of 20057311 is about 271.7007910430.

It can be divided in two parts, 2005 and 7311, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 20057311 in words is "twenty million, fifty-seven thousand, three hundred eleven".