1320020111 has 4 divisors (see below), whose sum is σ = 1320110424. Its totient is φ = 1319929800.

The previous prime is 1320020077. The next prime is 1320020161. The reversal of 1320020111 is 1110200231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1320020111 - 2¹⁰ = 1320019087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320020092 and 1320020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320020161) 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, 17645 + ... + 54326.

It is an arithmetic number, because the mean of its divisors is an integer number (330027606).

Almost surely, 2^1320020111 is an apocalyptic number.

1320020111 is a deficient number, since it is larger than the sum of its proper divisors (90313).

1320020111 is an equidigital number, since it uses as much as digits as its factorization.

1320020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90312.

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

The square root of 1320020111 is about 36332.0810166442. The cubic root of 1320020111 is about 1096.9668814150.

Adding to 1320020111 its reverse (1110200231), we get a palindrome (2430220342).

The spelling of 1320020111 in words is "one billion, three hundred twenty million, twenty thousand, one hundred eleven".