18920830 has 24 divisors (see below), whose sum is σ = 36184248. Its totient is φ = 7122048.

The previous prime is 18920821. The next prime is 18920831. The reversal of 18920830 is 3802981.

It is a junction number, because it is equal to n+sod(n) for n = 18920792 and 18920801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18920831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384 + ... + 6163.

It is an arithmetic number, because the mean of its divisors is an integer number (1507677).

Almost surely, 2^18920830 is an apocalyptic number.

18920830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18920830 is a deficient number, since it is larger than the sum of its proper divisors (17263418).

18920830 is a wasteful number, since it uses less digits than its factorization.

18920830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6588 (or 6571 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18920830 is about 4349.8080417416. The cubic root of 18920830 is about 266.4690219511.

The spelling of 18920830 in words is "eighteen million, nine hundred twenty thousand, eight hundred thirty".