20031311123 has 8 divisors (see below), whose sum is σ = 21660892992. Its totient is φ = 18451870336.

The previous prime is 20031311107. The next prime is 20031311141. The reversal of 20031311123 is 32111313002.

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

It is a cyclic number.

It is not a de Polignac number, because 20031311123 - 2⁴ = 20031311107 is a prime.

It is a super-2 number, since 2×20031311123² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (20031311023) 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, 12534440 + ... + 12536037.

It is an arithmetic number, because the mean of its divisors is an integer number (2707611624).

Almost surely, 2^20031311123 is an apocalyptic number.

20031311123 is a deficient number, since it is larger than the sum of its proper divisors (1629581869).

20031311123 is a wasteful number, since it uses less digits than its factorization.

20031311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25070541.

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

Adding to 20031311123 its reverse (32111313002), we get a palindrome (52142624125).

The spelling of 20031311123 in words is "twenty billion, thirty-one million, three hundred eleven thousand, one hundred twenty-three".