20420321111 has 4 divisors (see below), whose sum is σ = 20501677224. Its totient is φ = 20338965000.

The previous prime is 20420321101. The next prime is 20420321113. The reversal of 20420321111 is 11112302402.

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

It is a cyclic number.

It is not a de Polignac number, because 20420321111 - 2²⁶ = 20353212247 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 20420321111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420321113) 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, 40677680 + ... + 40678181.

It is an arithmetic number, because the mean of its divisors is an integer number (5125419306).

Almost surely, 2^20420321111 is an apocalyptic number.

20420321111 is a deficient number, since it is larger than the sum of its proper divisors (81356113).

20420321111 is an equidigital number, since it uses as much as digits as its factorization.

20420321111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81356112.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20420321111 its reverse (11112302402), we get a palindrome (31532623513).

The spelling of 20420321111 in words is "twenty billion, four hundred twenty million, three hundred twenty-one thousand, one hundred eleven".