20351111423 has 8 divisors (see below), whose sum is σ = 20826432000. Its totient is φ = 19875883608.

The previous prime is 20351111401. The next prime is 20351111449. The reversal of 20351111423 is 32411115302.

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 20351111423 - 2⁶ = 20351111359 is a prime.

It is a super-2 number, since 2×20351111423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351191423) 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, 637988 + ... + 669126.

It is an arithmetic number, because the mean of its divisors is an integer number (2603304000).

Almost surely, 2^20351111423 is an apocalyptic number.

20351111423 is a deficient number, since it is larger than the sum of its proper divisors (475320577).

20351111423 is a wasteful number, since it uses less digits than its factorization.

20351111423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46381.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 20351111423 its reverse (32411115302), we get a palindrome (52762226725).

The spelling of 20351111423 in words is "twenty billion, three hundred fifty-one million, one hundred eleven thousand, four hundred twenty-three".