20311131111 has 8 divisors (see below), whose sum is σ = 28258965120. Its totient is φ = 12952025592.

The previous prime is 20311131083. The next prime is 20311131131. The reversal of 20311131111 is 11113111302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20311131111 - 2⁹ = 20311130599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311131131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147182041 + ... + 147182178.

It is an arithmetic number, because the mean of its divisors is an integer number (3532370640).

Almost surely, 2^20311131111 is an apocalyptic number.

20311131111 is a deficient number, since it is larger than the sum of its proper divisors (7947834009).

20311131111 is a wasteful number, since it uses less digits than its factorization.

20311131111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294364245.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 20311131111 its reverse (11113111302), we get a palindrome (31424242413).

The spelling of 20311131111 in words is "twenty billion, three hundred eleven million, one hundred thirty-one thousand, one hundred eleven".