20000020111 has 4 divisors (see below), whose sum is σ = 20005893792. Its totient is φ = 19994146432.

The previous prime is 20000020099. The next prime is 20000020123. The reversal of 20000020111 is 11102000002.

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

It is an interprime number because it is at equal distance from previous prime (20000020099) and next prime (20000020123).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20000020111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000020094 and 20000020103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000020151) 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, 2931730 + ... + 2938543.

It is an arithmetic number, because the mean of its divisors is an integer number (5001473448).

Almost surely, 2^20000020111 is an apocalyptic number.

20000020111 is a deficient number, since it is larger than the sum of its proper divisors (5873681).

20000020111 is an equidigital number, since it uses as much as digits as its factorization.

20000020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5873680.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20000020111 its reverse (11102000002), we get a palindrome (31102020113).

The spelling of 20000020111 in words is "twenty billion, twenty thousand, one hundred eleven".