1820020020111 has 32 divisors (see below), whose sum is σ = 2859748182720. Its totient is φ = 1140047419392.

The previous prime is 1820020020103. The next prime is 1820020020121. The reversal of 1820020020111 is 1110200200281.

It is not a de Polignac number, because 1820020020111 - 2³ = 1820020020103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820020020121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3071140 + ... + 3615513.

It is an arithmetic number, because the mean of its divisors is an integer number (89367130710).

Almost surely, 2^{1820020020111} is an apocalyptic number.

1820020020111 is a deficient number, since it is larger than the sum of its proper divisors (1039728162609).

1820020020111 is a wasteful number, since it uses less digits than its factorization.

1820020020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6687272 (or 6687266 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1820020020111 its reverse (1110200200281), we get a palindrome (2930220220392).

The spelling of 1820020020111 in words is "one trillion, eight hundred twenty billion, twenty million, twenty thousand, one hundred eleven".