20013311 has 2 divisors, whose sum is σ = 20013312. Its totient is φ = 20013310.

The previous prime is 20013299. The next prime is 20013313. The reversal of 20013311 is 11331002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20013311 - 2⁶ = 20013247 is a prime.

Together with 20013313, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20013292 and 20013301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013313) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006655 + 10006656.

It is an arithmetic number, because the mean of its divisors is an integer number (10006656).

Almost surely, 2^20013311 is an apocalyptic number.

20013311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013311 is an equidigital number, since it uses as much as digits as its factorization.

20013311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 20013311 is about 4473.6239225040. The cubic root of 20013311 is about 271.5019676596.

Adding to 20013311 its reverse (11331002), we get a palindrome (31344313).

The spelling of 20013311 in words is "twenty million, thirteen thousand, three hundred eleven".