20011311 has 24 divisors (see below), whose sum is σ = 30357600. Its totient is φ = 12678336.

The previous prime is 20011309. The next prime is 20011319. The reversal of 20011311 is 11311002.

It is not a de Polignac number, because 20011311 - 2¹ = 20011309 is a prime.

It is a super-3 number, since 3×20011311³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20011293 and 20011302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011319) 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 23 ways as a sum of consecutive naturals, for example, 57165 + ... + 57513.

It is an arithmetic number, because the mean of its divisors is an integer number (1264900).

Almost surely, 2^20011311 is an apocalyptic number.

20011311 is a deficient number, since it is larger than the sum of its proper divisors (10346289).

20011311 is a wasteful number, since it uses less digits than its factorization.

20011311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 20011311 is about 4473.4003844950. The cubic root of 20011311 is about 271.4929233120.

Adding to 20011311 its reverse (11311002), we get a palindrome (31322313).

It can be divided in two parts, 200 and 11311, that added together give a palindrome (11511).

The spelling of 20011311 in words is "twenty million, eleven thousand, three hundred eleven".