20313311 has 4 divisors (see below), whose sum is σ = 21013800. Its totient is φ = 19612824.

The previous prime is 20313281. The next prime is 20313343. The reversal of 20313311 is 11331302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20313311 - 2⁶ = 20313247 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 (20313361) 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 3 ways as a sum of consecutive naturals, for example, 350201 + ... + 350258.

It is an arithmetic number, because the mean of its divisors is an integer number (5253450).

Almost surely, 2^20313311 is an apocalyptic number.

20313311 is a deficient number, since it is larger than the sum of its proper divisors (700489).

20313311 is an equidigital number, since it uses as much as digits as its factorization.

20313311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700488.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 20313311 is about 4507.0290658038. The cubic root of 20313311 is about 272.8518519770.

Adding to 20313311 its reverse (11331302), we get a palindrome (31644613).

Subtracting from 20313311 its reverse (11331302), we obtain a square (8982009 = 2997²).

The spelling of 20313311 in words is "twenty million, three hundred thirteen thousand, three hundred eleven".