20501011 has 2 divisors, whose sum is σ = 20501012. Its totient is φ = 20501010.

The previous prime is 20501009. The next prime is 20501021. The reversal of 20501011 is 11010502.

It is a happy number.

It is an a-pointer prime, because the next prime (20501021) can be obtained adding 20501011 to its sum of digits (10).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20501011 - 2¹ = 20501009 is a prime.

It is a super-3 number, since 3×20501011³ (a number of 23 digits) contains 333 as substring.

Together with 20501009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20501021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250505 + 10250506.

It is an arithmetic number, because the mean of its divisors is an integer number (10250506).

Almost surely, 2^20501011 is an apocalyptic number.

20501011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501011 is an equidigital number, since it uses as much as digits as its factorization.

20501011 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20501011 is about 4527.8042139651. The cubic root of 20501011 is about 273.6896827834.

Adding to 20501011 its reverse (11010502), we get a palindrome (31511513).

The spelling of 20501011 in words is "twenty million, five hundred one thousand, eleven".