18782420 has 12 divisors (see below), whose sum is σ = 39443124. Its totient is φ = 7512960.

The previous prime is 18782419. The next prime is 18782429. The reversal of 18782420 is 2428781.

It can be written as a sum of positive squares in 2 ways, for example, as 3400336 + 15382084 = 1844^2 + 3922^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18782429) 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, 469541 + ... + 469580.

It is an arithmetic number, because the mean of its divisors is an integer number (3286927).

Almost surely, 2^18782420 is an apocalyptic number.

18782420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18782420 is an abundant number, since it is smaller than the sum of its proper divisors (20660704).

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

18782420 is a wasteful number, since it uses less digits than its factorization.

18782420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939130 (or 939128 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 18782420 is about 4333.8689412579. The cubic root of 18782420 is about 265.8176714228.

The spelling of 18782420 in words is "eighteen million, seven hundred eighty-two thousand, four hundred twenty".