18820725 has 48 divisors (see below), whose sum is σ = 38807040. Its totient is φ = 7819200.

The previous prime is 18820699. The next prime is 18820729. The reversal of 18820725 is 52702881.

It is not a de Polignac number, because 18820725 - 2⁶ = 18820661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820729) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4146 + ... + 7404.

It is an arithmetic number, because the mean of its divisors is an integer number (808480).

Almost surely, 2^18820725 is an apocalyptic number.

18820725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18820725 is an abundant number, since it is smaller than the sum of its proper divisors (19986315).

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

18820725 is a wasteful number, since it uses less digits than its factorization.

18820725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290 (or 3285 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18820725 is about 4338.2859518478. The cubic root of 18820725 is about 265.9982521980.

The spelling of 18820725 in words is "eighteen million, eight hundred twenty thousand, seven hundred twenty-five".