18342420 has 48 divisors (see below), whose sum is σ = 51565248. Its totient is φ = 4871680.

The previous prime is 18342403. The next prime is 18342433. The reversal of 18342420 is 2424381.

It is a congruent number.

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, 20380 + ... + 21260.

It is an arithmetic number, because the mean of its divisors is an integer number (1074276).

Almost surely, 2^18342420 is an apocalyptic number.

18342420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18342420 is an abundant number, since it is smaller than the sum of its proper divisors (33222828).

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

18342420 is a wasteful number, since it uses less digits than its factorization.

18342420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 18342420 is about 4282.8051555026. The cubic root of 18342420 is about 263.7255527156.

The spelling of 18342420 in words is "eighteen million, three hundred forty-two thousand, four hundred twenty".