20970011 has 2 divisors, whose sum is σ = 20970012. Its totient is φ = 20970010.

The previous prime is 20969989. The next prime is 20970049. The reversal of 20970011 is 11007902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20970011 - 2¹⁸ = 20707867 is a prime.

It is a super-3 number, since 3×20970011³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20970071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10485005 + 10485006.

It is an arithmetic number, because the mean of its divisors is an integer number (10485006).

Almost surely, 2^20970011 is an apocalyptic number.

20970011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20970011 is an equidigital number, since it uses as much as digits as its factorization.

20970011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 20970011 is about 4579.3024577986. The cubic root of 20970011 is about 275.7610259037.

Adding to 20970011 its reverse (11007902), we get a palindrome (31977913).

The spelling of 20970011 in words is "twenty million, nine hundred seventy thousand, eleven".