20513341111 has 4 divisors (see below), whose sum is σ = 21175061824. Its totient is φ = 19851620400.

The previous prime is 20513341099. The next prime is 20513341181. The reversal of 20513341111 is 11114331502.

It is a happy number.

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-20513341111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513341181) 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, 330860310 + ... + 330860371.

It is an arithmetic number, because the mean of its divisors is an integer number (5293765456).

Almost surely, 2^20513341111 is an apocalyptic number.

20513341111 is a deficient number, since it is larger than the sum of its proper divisors (661720713).

20513341111 is an equidigital number, since it uses as much as digits as its factorization.

20513341111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661720712.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 20513341111 its reverse (11114331502), we get a palindrome (31627672613).

The spelling of 20513341111 in words is "twenty billion, five hundred thirteen million, three hundred forty-one thousand, one hundred eleven".