20100020111 has 4 divisors (see below), whose sum is σ = 20342189112. Its totient is φ = 19857851112.

The previous prime is 20100020099. The next prime is 20100020117. The reversal of 20100020111 is 11102000102.

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 20100020111 - 2²² = 20095825807 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 (20100020117) 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, 121084376 + ... + 121084541.

It is an arithmetic number, because the mean of its divisors is an integer number (5085547278).

Almost surely, 2^20100020111 is an apocalyptic number.

20100020111 is a deficient number, since it is larger than the sum of its proper divisors (242169001).

20100020111 is an equidigital number, since it uses as much as digits as its factorization.

20100020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242169000.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20100020111 its reverse (11102000102), we get a palindrome (31202020213).

The spelling of 20100020111 in words is "twenty billion, one hundred million, twenty thousand, one hundred eleven".