20201020111 has 4 divisors (see below), whose sum is σ = 20201482800. Its totient is φ = 20200557424.

The previous prime is 20201020067. The next prime is 20201020123. The reversal of 20201020111 is 11102010202.

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 20201020111 - 2⁹ = 20201019599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201020811) 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 in 3 ways as a sum of consecutive naturals, for example, 158131 + ... + 255748.

It is an arithmetic number, because the mean of its divisors is an integer number (5050370700).

Almost surely, 2^20201020111 is an apocalyptic number.

20201020111 is a deficient number, since it is larger than the sum of its proper divisors (462689).

20201020111 is an equidigital number, since it uses as much as digits as its factorization.

20201020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462688.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20201020111 its reverse (11102010202), we get a palindrome (31303030313).

Subtracting from 20201020111 its reverse (11102010202), we obtain a palindrome (9099009909).

The spelling of 20201020111 in words is "twenty billion, two hundred one million, twenty thousand, one hundred eleven".