20013123311 has 8 divisors (see below), whose sum is σ = 20441212080. Its totient is φ = 19588840128.

The previous prime is 20013123293. The next prime is 20013123343. The reversal of 20013123311 is 11332131002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013123311 is a prime.

It is a super-2 number, since 2×20013123311² (a number of 21 digits) contains 22 as substring.

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 20013123311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013123371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940766 + ... + 961803.

It is an arithmetic number, because the mean of its divisors is an integer number (2555151510).

Almost surely, 2^20013123311 is an apocalyptic number.

20013123311 is a deficient number, since it is larger than the sum of its proper divisors (428088769).

20013123311 is a wasteful number, since it uses less digits than its factorization.

20013123311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902793.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20013123311 its reverse (11332131002), we get a palindrome (31345254313).

The spelling of 20013123311 in words is "twenty billion, thirteen million, one hundred twenty-three thousand, three hundred eleven".