18825820 has 48 divisors (see below), whose sum is σ = 43309728. Its totient is φ = 6831360.

The previous prime is 18825809. The next prime is 18825823. The reversal of 18825820 is 2852881.

It is a happy number.

It is a super-2 number, since 2×18825820² = 708822997344800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18825823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15267 + ... + 16453.

It is an arithmetic number, because the mean of its divisors is an integer number (902286).

Almost surely, 2^18825820 is an apocalyptic number.

18825820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18825820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21654864).

18825820 is an abundant number, since it is smaller than the sum of its proper divisors (24483908).

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

18825820 is a wasteful number, since it uses less digits than its factorization.

18825820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270 (or 1268 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 18825820 is about 4338.8731255938. The cubic root of 18825820 is about 266.0222530236.

The spelling of 18825820 in words is "eighteen million, eight hundred twenty-five thousand, eight hundred twenty".