20011291 has 2 divisors, whose sum is σ = 20011292. Its totient is φ = 20011290.

The previous prime is 20011289. The next prime is 20011301. The reversal of 20011291 is 19211002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20011291 - 2¹ = 20011289 is a prime.

Together with 20011289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20081291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005645 + 10005646.

It is an arithmetic number, because the mean of its divisors is an integer number (10005646).

Almost surely, 2^20011291 is an apocalyptic number.

20011291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011291 is an equidigital number, since it uses as much as digits as its factorization.

20011291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 20011291 is about 4473.3981490585. The cubic root of 20011291 is about 271.4928328655.

Adding to 20011291 its reverse (19211002), we get a palindrome (39222293).

It can be divided in two parts, 20011 and 291, that added together give a palindrome (20302).

The spelling of 20011291 in words is "twenty million, eleven thousand, two hundred ninety-one".