20051011 has 4 divisors (see below), whose sum is σ = 20138800. Its totient is φ = 19963224.

The previous prime is 20050981. The next prime is 20051047. The reversal of 20051011 is 11015002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20051011 - 2¹⁹ = 19526723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20051071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43551 + ... + 44008.

It is an arithmetic number, because the mean of its divisors is an integer number (5034700).

Almost surely, 2^20051011 is an apocalyptic number.

20051011 is a deficient number, since it is larger than the sum of its proper divisors (87789).

20051011 is an equidigital number, since it uses as much as digits as its factorization.

20051011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87788.

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

The square root of 20051011 is about 4477.8355262336. The cubic root of 20051011 is about 271.6723409975.

Adding to 20051011 its reverse (11015002), we get a palindrome (31066013).

The spelling of 20051011 in words is "twenty million, fifty-one thousand, eleven".