18928830820 has 12 divisors (see below), whose sum is σ = 39750544764. Its totient is φ = 7571532320.

The previous prime is 18928830797. The next prime is 18928830839. The reversal of 18928830820 is 2803882981.

It can be written as a sum of positive squares in 2 ways, for example, as 2460755236 + 16468075584 = 49606^2 + 128328^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473220751 + ... + 473220790.

It is an arithmetic number, because the mean of its divisors is an integer number (3312545397).

Almost surely, 2^18928830820 is an apocalyptic number.

18928830820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18928830820 is an abundant number, since it is smaller than the sum of its proper divisors (20821713944).

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

18928830820 is a wasteful number, since it uses less digits than its factorization.

18928830820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946441550 (or 946441548 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 49.

The spelling of 18928830820 in words is "eighteen billion, nine hundred twenty-eight million, eight hundred thirty thousand, eight hundred twenty".