23420355511 has 12 divisors (see below), whose sum is σ = 27260986440. Its totient is φ = 20062138320.

The previous prime is 23420355499. The next prime is 23420355527. The reversal of 23420355511 is 11555302432.

It is not a de Polignac number, because 23420355511 - 2¹⁵ = 23420322743 is a prime.

It is a super-2 number, since 2×23420355511² (a number of 22 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 (23420355551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68001 + ... + 226858.

It is an arithmetic number, because the mean of its divisors is an integer number (2271748870).

Almost surely, 2^23420355511 is an apocalyptic number.

23420355511 is a deficient number, since it is larger than the sum of its proper divisors (3840630929).

23420355511 is a wasteful number, since it uses less digits than its factorization.

23420355511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296494 (or 296487 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 23420355511 its reverse (11555302432), we get a palindrome (34975657943).

The spelling of 23420355511 in words is "twenty-three billion, four hundred twenty million, three hundred fifty-five thousand, five hundred eleven".