18846820 has 12 divisors (see below), whose sum is σ = 39578364. Its totient is φ = 7538720.

The previous prime is 18846811. The next prime is 18846827. The reversal of 18846820 is 2864881.

It can be written as a sum of positive squares in 2 ways, for example, as 2509056 + 16337764 = 1584^2 + 4042^2 .

It is a super-2 number, since 2×18846820² = 710405248224800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18846820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18846827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471151 + ... + 471190.

It is an arithmetic number, because the mean of its divisors is an integer number (3298197).

Almost surely, 2^18846820 is an apocalyptic number.

18846820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18846820 is an abundant number, since it is smaller than the sum of its proper divisors (20731544).

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

18846820 is a wasteful number, since it uses less digits than its factorization.

18846820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942350 (or 942348 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 18846820 is about 4341.2924342873. The cubic root of 18846820 is about 266.1211312555.

The spelling of 18846820 in words is "eighteen million, eight hundred forty-six thousand, eight hundred twenty".