20111020020001 has 4 divisors (see below), whose sum is σ = 20142296879152. Its totient is φ = 20079743160852.

The previous prime is 20111020019947. The next prime is 20111020020019. The reversal of 20111020020001 is 10002002011102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20111020020001 - 2⁷ = 20111020019873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111020020001.

It is not an unprimeable number, because it can be changed into a prime (20111020020041) 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, 15638428611 + ... + 15638429896.

It is an arithmetic number, because the mean of its divisors is an integer number (5035574219788).

Almost surely, 2^{20111020020001} is an apocalyptic number.

It is an amenable number.

20111020020001 is a deficient number, since it is larger than the sum of its proper divisors (31276859151).

20111020020001 is an equidigital number, since it uses as much as digits as its factorization.

20111020020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31276859150.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20111020020001 its reverse (10002002011102), we get a palindrome (30113022031103).

The spelling of 20111020020001 in words is "twenty trillion, one hundred eleven billion, twenty million, twenty thousand, one".