18820430 has 16 divisors (see below), whose sum is σ = 33927120. Its totient is φ = 7516992.

The previous prime is 18820429. The next prime is 18820433. The reversal of 18820430 is 3402881.

It is a self number, because there is not a number n which added to its sum of digits gives 18820430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10457 + ... + 12123.

It is an arithmetic number, because the mean of its divisors is an integer number (2120445).

Almost surely, 2^18820430 is an apocalyptic number.

18820430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18820430 is a deficient number, since it is larger than the sum of its proper divisors (15106690).

18820430 is a wasteful number, since it uses less digits than its factorization.

18820430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18820430 is about 4338.2519521116. The cubic root of 18820430 is about 265.9968624199.

The spelling of 18820430 in words is "eighteen million, eight hundred twenty thousand, four hundred thirty".