20051611 has 4 divisors (see below), whose sum is σ = 20277000. Its totient is φ = 19826224.

The previous prime is 20051609. The next prime is 20051617. The reversal of 20051611 is 11615002.

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 20051611 - 2¹ = 20051609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20051617) 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, 112561 + ... + 112738.

It is an arithmetic number, because the mean of its divisors is an integer number (5069250).

Almost surely, 2^20051611 is an apocalyptic number.

20051611 is a deficient number, since it is larger than the sum of its proper divisors (225389).

20051611 is an equidigital number, since it uses as much as digits as its factorization.

20051611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225388.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 20051611 is about 4477.9025223870. The cubic root of 20051611 is about 271.6750507824.

Adding to 20051611 its reverse (11615002), we get a palindrome (31666613).

The spelling of 20051611 in words is "twenty million, fifty-one thousand, six hundred eleven".