20311011123 has 8 divisors (see below), whose sum is σ = 29164528848. Its totient is φ = 12499083744.

The previous prime is 20311011053. The next prime is 20311011157. The reversal of 20311011123 is 32111011302.

It is a happy number.

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

It is not a de Polignac number, because 20311011123 - 2¹⁶ = 20310945587 is a prime.

It is a super-2 number, since 2×20311011123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20311011163) 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, 260397540 + ... + 260397617.

It is an arithmetic number, because the mean of its divisors is an integer number (3645566106).

Almost surely, 2^20311011123 is an apocalyptic number.

20311011123 is a deficient number, since it is larger than the sum of its proper divisors (8853517725).

20311011123 is a wasteful number, since it uses less digits than its factorization.

20311011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520795173.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20311011123 its reverse (32111011302), we get a palindrome (52422022425).

The spelling of 20311011123 in words is "twenty billion, three hundred eleven million, eleven thousand, one hundred twenty-three".