23420137534 has 4 divisors (see below), whose sum is σ = 35130206304. Its totient is φ = 11710068766.

The previous prime is 23420137529. The next prime is 23420137577. The reversal of 23420137534 is 43573102432.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×23420137534² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23420137534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5855034382 + ... + 5855034385.

It is an arithmetic number, because the mean of its divisors is an integer number (8782551576).

Almost surely, 2^23420137534 is an apocalyptic number.

23420137534 is a deficient number, since it is larger than the sum of its proper divisors (11710068770).

23420137534 is a wasteful number, since it uses less digits than its factorization.

23420137534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11710068769.

The product of its (nonzero) digits is 60480, while the sum is 34.

Adding to 23420137534 its reverse (43573102432), we get a palindrome (66993239966).

The spelling of 23420137534 in words is "twenty-three billion, four hundred twenty million, one hundred thirty-seven thousand, five hundred thirty-four".