23181520444 has 24 divisors (see below), whose sum is σ = 40818395520. Its totient is φ = 11519175744.

The previous prime is 23181520387. The next prime is 23181520451. The reversal of 23181520444 is 44402518132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2319442 + ... + 2329414.

It is an arithmetic number, because the mean of its divisors is an integer number (1700766480).

Almost surely, 2^23181520444 is an apocalyptic number.

It is an amenable number.

23181520444 is a deficient number, since it is larger than the sum of its proper divisors (17636875076).

23181520444 is a wasteful number, since it uses less digits than its factorization.

23181520444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13509 (or 13507 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The spelling of 23181520444 in words is "twenty-three billion, one hundred eighty-one million, five hundred twenty thousand, four hundred forty-four".