18471420 has 144 divisors (see below), whose sum is σ = 64471680. Its totient is φ = 4233600.

The previous prime is 18471407. The next prime is 18471421. The reversal of 18471420 is 2417481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18471421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37375 + ... + 37865.

It is an arithmetic number, because the mean of its divisors is an integer number (447720).

Almost surely, 2^18471420 is an apocalyptic number.

18471420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18471420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32235840).

18471420 is an abundant number, since it is smaller than the sum of its proper divisors (46000260).

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

18471420 is a wasteful number, since it uses less digits than its factorization.

18471420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 18471420 is about 4297.8389918656. The cubic root of 18471420 is about 264.3423588627.

The spelling of 18471420 in words is "eighteen million, four hundred seventy-one thousand, four hundred twenty".