20320355111 has 16 divisors (see below), whose sum is σ = 23323944768. Its totient is φ = 17342035200.

The previous prime is 20320355101. The next prime is 20320355113. The reversal of 20320355111 is 11155302302.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20320355111 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 (20320355113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3185321 + ... + 3191693.

It is an arithmetic number, because the mean of its divisors is an integer number (1457746548).

Almost surely, 2^20320355111 is an apocalyptic number.

20320355111 is a deficient number, since it is larger than the sum of its proper divisors (3003589657).

20320355111 is a wasteful number, since it uses less digits than its factorization.

20320355111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8282.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 20320355111 its reverse (11155302302), we get a palindrome (31475657413).

The spelling of 20320355111 in words is "twenty billion, three hundred twenty million, three hundred fifty-five thousand, one hundred eleven".