18820485 has 32 divisors (see below), whose sum is σ = 33792000. Its totient is φ = 9937728.

The previous prime is 18820481. The next prime is 18820493. The reversal of 18820485 is 58402881.

It is not a de Polignac number, because 18820485 - 2² = 18820481 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820481) 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 31 ways as a sum of consecutive naturals, for example, 14076 + ... + 15354.

It is an arithmetic number, because the mean of its divisors is an integer number (1056000).

Almost surely, 2^18820485 is an apocalyptic number.

18820485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18820485 is a deficient number, since it is larger than the sum of its proper divisors (14971515).

18820485 is a wasteful number, since it uses less digits than its factorization.

18820485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402 (or 1396 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 18820485 is about 4338.2582910657. The cubic root of 18820485 is about 265.9971215322.

The spelling of 18820485 in words is "eighteen million, eight hundred twenty thousand, four hundred eighty-five".