20718011 has 2 divisors, whose sum is σ = 20718012. Its totient is φ = 20718010.

The previous prime is 20717993. The next prime is 20718017. The reversal of 20718011 is 11081702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20718011 - 2⁶ = 20717947 is a prime.

It is a super-2 number, since 2×20718011² = 858471959592242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20718017) 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 as a sum of consecutive naturals, namely, 10359005 + 10359006.

It is an arithmetic number, because the mean of its divisors is an integer number (10359006).

Almost surely, 2^20718011 is an apocalyptic number.

20718011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20718011 is an equidigital number, since it uses as much as digits as its factorization.

20718011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 20718011 is about 4551.7041863460. The cubic root of 20718011 is about 274.6519497631.

Adding to 20718011 its reverse (11081702), we get a palindrome (31799713).

The spelling of 20718011 in words is "twenty million, seven hundred eighteen thousand, eleven".