20680311 has 4 divisors (see below), whose sum is σ = 27573752. Its totient is φ = 13786872.

The previous prime is 20680271. The next prime is 20680333. The reversal of 20680311 is 11308602.

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

It is not a de Polignac number, because 20680311 - 2⁷ = 20680183 is a prime.

It is a super-3 number, since 3×20680311³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446716 + ... + 3446721.

It is an arithmetic number, because the mean of its divisors is an integer number (6893438).

Almost surely, 2^20680311 is an apocalyptic number.

20680311 is a deficient number, since it is larger than the sum of its proper divisors (6893441).

20680311 is an equidigital number, since it uses as much as digits as its factorization.

20680311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6893440.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20680311 is about 4547.5609946432. The cubic root of 20680311 is about 274.4852563904.

Adding to 20680311 its reverse (11308602), we get a palindrome (31988913).

The spelling of 20680311 in words is "twenty million, six hundred eighty thousand, three hundred eleven".