9181820920 has 16 divisors (see below), whose sum is σ = 20659097160. Its totient is φ = 3672728352.

The previous prime is 9181820867. The next prime is 9181820939. The reversal of 9181820920 is 290281819.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 229545523 = 9181820920 / (9 + 1 + 8 + 1 + 8 + 2 + 0 + 9 + 2 + 0).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 114772722 + ... + 114772801.

Almost surely, 2^9181820920 is an apocalyptic number.

It is an amenable number.

9181820920 is an abundant number, since it is smaller than the sum of its proper divisors (11477276240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9181820920 is a wasteful number, since it uses less digits than its factorization.

9181820920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229545534 (or 229545530 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 9181820920 is about 95821.8186009846. The cubic root of 9181820920 is about 2093.9980490320.

The spelling of 9181820920 in words is "nine billion, one hundred eighty-one million, eight hundred twenty thousand, nine hundred twenty".