20010203111 has 4 divisors (see below), whose sum is σ = 20137656792. Its totient is φ = 19882749432.

The previous prime is 20010203099. The next prime is 20010203117. The reversal of 20010203111 is 11130201002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010203111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010203092 and 20010203101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010203117) 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, 63726605 + ... + 63726918.

It is an arithmetic number, because the mean of its divisors is an integer number (5034414198).

Almost surely, 2^20010203111 is an apocalyptic number.

20010203111 is a deficient number, since it is larger than the sum of its proper divisors (127453681).

20010203111 is a wasteful number, since it uses less digits than its factorization.

20010203111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127453680.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20010203111 its reverse (11130201002), we get a palindrome (31140404113).

The spelling of 20010203111 in words is "twenty billion, ten million, two hundred three thousand, one hundred eleven".