20201311 has 4 divisors (see below), whose sum is σ = 21755272. Its totient is φ = 18647352.

The previous prime is 20201303. The next prime is 20201329. The reversal of 20201311 is 11310202.

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 20201311 - 2³ = 20201303 is a prime.

It is a super-2 number, since 2×20201311² = 816185932237442, which contains 22 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 (20201341) 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, 776961 + ... + 776986.

It is an arithmetic number, because the mean of its divisors is an integer number (5438818).

Almost surely, 2^20201311 is an apocalyptic number.

20201311 is a deficient number, since it is larger than the sum of its proper divisors (1553961).

20201311 is a wasteful number, since it uses less digits than its factorization.

20201311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553960.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20201311 is about 4494.5868553183. The cubic root of 20201311 is about 272.3494598185.

Adding to 20201311 its reverse (11310202), we get a palindrome (31511513).

The spelling of 20201311 in words is "twenty million, two hundred one thousand, three hundred eleven".