18136420 has 48 divisors (see below), whose sum is σ = 40279680. Its totient is φ = 6845696.

The previous prime is 18136409. The next prime is 18136421. The reversal of 18136420 is 2463181.

It is not an unprimeable number, because it can be changed into a prime (18136421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40719 + ... + 41161.

It is an arithmetic number, because the mean of its divisors is an integer number (839160).

Almost surely, 2^18136420 is an apocalyptic number.

18136420 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 18136420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20139840).

18136420 is an abundant number, since it is smaller than the sum of its proper divisors (22143260).

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

18136420 is a wasteful number, since it uses less digits than its factorization.

18136420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18136420 is about 4258.6875912656. The cubic root of 18136420 is about 262.7345507533.

The spelling of 18136420 in words is "eighteen million, one hundred thirty-six thousand, four hundred twenty".