18674820 has 48 divisors (see below), whose sum is σ = 58101120. Its totient is φ = 4979808.

The previous prime is 18674819. The next prime is 18674837. The reversal of 18674820 is 2847681.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16752 + ... + 17831.

It is an arithmetic number, because the mean of its divisors is an integer number (1210440).

Almost surely, 2^18674820 is an apocalyptic number.

18674820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18674820 is an abundant number, since it is smaller than the sum of its proper divisors (39426300).

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

18674820 is a wasteful number, since it uses less digits than its factorization.

18674820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34601 (or 34593 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18674820 is about 4321.4372609122. The cubic root of 18674820 is about 265.3090970234.

The spelling of 18674820 in words is "eighteen million, six hundred seventy-four thousand, eight hundred twenty".