18874820 has 12 divisors (see below), whose sum is σ = 39637164. Its totient is φ = 7549920.

The previous prime is 18874787. The next prime is 18874831. The reversal of 18874820 is 2847881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14622976 + 4251844 = 3824^2 + 2062^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471851 + ... + 471890.

It is an arithmetic number, because the mean of its divisors is an integer number (3303097).

Almost surely, 2^18874820 is an apocalyptic number.

18874820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18874820 is an abundant number, since it is smaller than the sum of its proper divisors (20762344).

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

18874820 is a wasteful number, since it uses less digits than its factorization.

18874820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943750 (or 943748 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 18874820 is about 4344.5160835241. The cubic root of 18874820 is about 266.2528547087.

The spelling of 18874820 in words is "eighteen million, eight hundred seventy-four thousand, eight hundred twenty".