20020120111001 has 4 divisors (see below), whose sum is σ = 20020353170532. Its totient is φ = 20019887051472.

The previous prime is 20020120110971. The next prime is 20020120111037. The reversal of 20020120111001 is 10011102102002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4126183752601 + 15893936358400 = 2031301^2 + 3986720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020120111001 is a prime.

It is a super-2 number, since 2×20020120111001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020120116001) 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, 116400866 + ... + 116572731.

It is an arithmetic number, because the mean of its divisors is an integer number (5005088292633).

Almost surely, 2^{20020120111001} is an apocalyptic number.

It is an amenable number.

20020120111001 is a deficient number, since it is larger than the sum of its proper divisors (233059531).

20020120111001 is an equidigital number, since it uses as much as digits as its factorization.

20020120111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233059530.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20020120111001 its reverse (10011102102002), we get a palindrome (30031222213003).

It can be divided in two parts, 20020 and 120111001, that added together give a palindrome (120131021).

The spelling of 20020120111001 in words is "twenty trillion, twenty billion, one hundred twenty million, one hundred eleven thousand, one".